61321916 has 12 divisors (see below), whose sum is σ = 107369640. Its totient is φ = 30644880.

The previous prime is 61321891. The next prime is 61321961. The reversal of 61321916 is 61912316.

It is a super-2 number, since 2×61321916² = 7520754763822112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9971 + ... + 14901.

It is an arithmetic number, because the mean of its divisors is an integer number (8947470).

Almost surely, 2^61321916 is an apocalyptic number.

It is an amenable number.

61321916 is a deficient number, since it is larger than the sum of its proper divisors (46047724).

61321916 is a wasteful number, since it uses less digits than its factorization.

61321916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8044 (or 8042 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 61321916 is about 7830.8311180870. The cubic root of 61321916 is about 394.3409744664.

The spelling of 61321916 in words is "sixty-one million, three hundred twenty-one thousand, nine hundred sixteen".