61921512 has 48 divisors (see below), whose sum is σ = 168295140. Its totient is φ = 20567808.

The previous prime is 61921511. The next prime is 61921523. The reversal of 61921512 is 21512916.

61921512 is a `hidden beast` number, since 61 + 92 + 1 + 512 = 666.

61921512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61685316 + 236196 = 7854^2 + 486^2 .

It is a super-2 number, since 2×61921512² = 7668547296732288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61921511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21468 + ... + 24180.

Almost surely, 2^61921512 is an apocalyptic number.

It is an amenable number.

61921512 is an abundant number, since it is smaller than the sum of its proper divisors (106373628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61921512 is a wasteful number, since it uses less digits than its factorization.

61921512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042 (or 3035 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 61921512 is about 7869.0223026752. The cubic root of 61921512 is about 395.6220759276.

The spelling of 61921512 in words is "sixty-one million, nine hundred twenty-one thousand, five hundred twelve".