68153931 has 24 divisors (see below), whose sum is σ = 106164240. Its totient is φ = 41990400.

The previous prime is 68153927. The next prime is 68153933. The reversal of 68153931 is 13935186.

It is a happy number.

It is not a de Polignac number, because 68153931 - 2² = 68153927 is a prime.

It is a super-2 number, since 2×68153931² = 9289916621505522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68153933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2151 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (4423510).

Almost surely, 2^68153931 is an apocalyptic number.

68153931 is a deficient number, since it is larger than the sum of its proper divisors (38010309).

68153931 is a wasteful number, since it uses less digits than its factorization.

68153931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9787 (or 9784 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 68153931 is about 8255.5394130244. The cubic root of 68153931 is about 408.4732649758.

The spelling of 68153931 in words is "sixty-eight million, one hundred fifty-three thousand, nine hundred thirty-one".