151993931 has 4 divisors (see below), whose sum is σ = 152018592. Its totient is φ = 151969272.

The previous prime is 151993921. The next prime is 151993943. The reversal of 151993931 is 139399151.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 151993931 - 2¹⁴ = 151977547 is a prime.

It is a super-2 number, since 2×151993931² = 46204310121665522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151993921) 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, 5885 + ... + 18401.

It is an arithmetic number, because the mean of its divisors is an integer number (38004648).

Almost surely, 2^151993931 is an apocalyptic number.

151993931 is a deficient number, since it is larger than the sum of its proper divisors (24661).

151993931 is a wasteful number, since it uses less digits than its factorization.

151993931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24660.

The product of its digits is 32805, while the sum is 41.

The square root of 151993931 is about 12328.5818730298. The cubic root of 151993931 is about 533.6732267860.

The spelling of 151993931 in words is "one hundred fifty-one million, nine hundred ninety-three thousand, nine hundred thirty-one".