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7242561 = 331731509
BaseRepresentation
bin11011101000001101000001
3111121221221000
4123220031001
53323230221
6415122213
7115363224
oct33501501
914557830
107242561
1140a7497
122513369
131667751
14d675bb
15980e26
hex6e8341

7242561 has 32 divisors (see below), whose sum is σ = 11750400. Its totient is φ = 4389120.

The previous prime is 7242551. The next prime is 7242569. The reversal of 7242561 is 1652427.

It is not a de Polignac number, because 7242561 - 29 = 7242049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (3360) is a multiple of the sum of its prime divisors (560).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7242569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13975 + ... + 14483.

It is an arithmetic number, because the mean of its divisors is an integer number (367200).

Almost surely, 27242561 is an apocalyptic number.

It is an amenable number.

7242561 is a deficient number, since it is larger than the sum of its proper divisors (4507839).

7242561 is a wasteful number, since it uses less digits than its factorization.

7242561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 560 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 7242561 is about 2691.2006614149. The cubic root of 7242561 is about 193.4776129379.

Adding to 7242561 its reverse (1652427), we get a palindrome (8894988).

The spelling of 7242561 in words is "seven million, two hundred forty-two thousand, five hundred sixty-one".

Divisors: 1 3 9 17 27 31 51 93 153 279 459 509 527 837 1527 1581 4581 4743 8653 13743 14229 15779 25959 47337 77877 142011 233631 268243 426033 804729 2414187 7242561