151231986 has 24 divisors (see below), whose sum is σ = 333225360. Its totient is φ = 49555896.

The previous prime is 151231973. The next prime is 151231999. The reversal of 151231986 is 689132151.

151231986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (151231973) and next prime (151231999).

It is a super-2 number, since 2×151231986² = 45742227179008392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 151231986.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70140 + ... + 72263.

It is an arithmetic number, because the mean of its divisors is an integer number (13884390).

Almost surely, 2^151231986 is an apocalyptic number.

151231986 is an abundant number, since it is smaller than the sum of its proper divisors (181993374).

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

151231986 is a wasteful number, since it uses less digits than its factorization.

151231986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142470 (or 142467 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 151231986 is about 12297.6414811947. The cubic root of 151231986 is about 532.7799651923.

The spelling of 151231986 in words is "one hundred fifty-one million, two hundred thirty-one thousand, nine hundred eighty-six".