61262221 has 4 divisors (see below), whose sum is σ = 61396732. Its totient is φ = 61127712.

The previous prime is 61262207. The next prime is 61262249. The reversal of 61262221 is 12226216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 30858025 = 5514^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 61262221 - 2¹⁵ = 61229453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61262192 and 61262201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61262521) 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, 66570 + ... + 67483.

It is an arithmetic number, because the mean of its divisors is an integer number (15349183).

Almost surely, 2^61262221 is an apocalyptic number.

It is an amenable number.

61262221 is a deficient number, since it is larger than the sum of its proper divisors (134511).

61262221 is a wasteful number, since it uses less digits than its factorization.

61262221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134510.

The product of its digits is 576, while the sum is 22.

The square root of 61262221 is about 7827.0186533571. The cubic root of 61262221 is about 394.2129733172.

Adding to 61262221 its reverse (12226216), we get a palindrome (73488437).

The spelling of 61262221 in words is "sixty-one million, two hundred sixty-two thousand, two hundred twenty-one".