4261561 has 4 divisors (see below), whose sum is σ = 4294224. Its totient is φ = 4228900.

The previous prime is 4261553. The next prime is 4261583. The reversal of 4261561 is 1651624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4261561 - 2³ = 4261553 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4261541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16135 + ... + 16396.

It is an arithmetic number, because the mean of its divisors is an integer number (1073556).

Almost surely, 2^4261561 is an apocalyptic number.

It is an amenable number.

4261561 is a deficient number, since it is larger than the sum of its proper divisors (32663).

4261561 is a wasteful number, since it uses less digits than its factorization.

4261561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32662.

The product of its digits is 1440, while the sum is 25.

The square root of 4261561 is about 2064.3548629051. The cubic root of 4261561 is about 162.1273321925.

The spelling of 4261561 in words is "four million, two hundred sixty-one thousand, five hundred sixty-one".