61921556 has 12 divisors (see below), whose sum is σ = 108497760. Its totient is φ = 30922200.

The previous prime is 61921553. The next prime is 61921567. The reversal of 61921556 is 65512916.

It is a super-2 number, since 2×61921556² = 7668558194922272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61921553) 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, 5870 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (9041480).

Almost surely, 2^61921556 is an apocalyptic number.

It is an amenable number.

61921556 is a deficient number, since it is larger than the sum of its proper divisors (46576204).

61921556 is a wasteful number, since it uses less digits than its factorization.

61921556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19294 (or 19292 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 61921556 is about 7869.0250984477. The cubic root of 61921556 is about 395.6221696342.

The spelling of 61921556 in words is "sixty-one million, nine hundred twenty-one thousand, five hundred fifty-six".