64121931 has 12 divisors (see below), whose sum is σ = 93158208. Its totient is φ = 42499824.

The previous prime is 64121879. The next prime is 64121957. The reversal of 64121931 is 13912146.

64121931 is a `hidden beast` number, since 641 + 2 + 19 + 3 + 1 = 666.

It is not a de Polignac number, because 64121931 - 2⁶ = 64121867 is a prime.

It is a super-3 number, since 3×64121931³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 64121895 and 64121904.

It is not an unprimeable number, because it can be changed into a prime (64121231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19035 + ... + 22148.

It is an arithmetic number, because the mean of its divisors is an integer number (7763184).

Almost surely, 2^64121931 is an apocalyptic number.

64121931 is a deficient number, since it is larger than the sum of its proper divisors (29036277).

64121931 is a wasteful number, since it uses less digits than its factorization.

64121931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41362 (or 41359 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 64121931 is about 8007.6170612736. The cubic root of 64121931 is about 400.2538617681.

The spelling of 64121931 in words is "sixty-four million, one hundred twenty-one thousand, nine hundred thirty-one".