61455521 has 4 divisors (see below), whose sum is σ = 62497200. Its totient is φ = 60413844.

The previous prime is 61455509. The next prime is 61455539. The reversal of 61455521 is 12555416.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-61455521 is a prime.

It is a super-2 number, since 2×61455521² = 7553562122762882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61455551) 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, 520751 + ... + 520868.

It is an arithmetic number, because the mean of its divisors is an integer number (15624300).

Almost surely, 2^61455521 is an apocalyptic number.

It is an amenable number.

61455521 is a deficient number, since it is larger than the sum of its proper divisors (1041679).

61455521 is a wasteful number, since it uses less digits than its factorization.

61455521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041678.

The product of its digits is 6000, while the sum is 29.

The square root of 61455521 is about 7839.3571802795. The cubic root of 61455521 is about 394.6271565932.

The spelling of 61455521 in words is "sixty-one million, four hundred fifty-five thousand, five hundred twenty-one".