61457621 has 4 divisors (see below), whose sum is σ = 62886912. Its totient is φ = 60028332.

The previous prime is 61457611. The next prime is 61457639. The reversal of 61457621 is 12675416.

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-61457621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61457611) 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, 714581 + ... + 714666.

It is an arithmetic number, because the mean of its divisors is an integer number (15721728).

Almost surely, 2^61457621 is an apocalyptic number.

It is an amenable number.

61457621 is a deficient number, since it is larger than the sum of its proper divisors (1429291).

61457621 is a wasteful number, since it uses less digits than its factorization.

61457621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429290.

The product of its digits is 10080, while the sum is 32.

The square root of 61457621 is about 7839.4911186888. The cubic root of 61457621 is about 394.6316514841.

The spelling of 61457621 in words is "sixty-one million, four hundred fifty-seven thousand, six hundred twenty-one".