151991123 has 4 divisors (see below), whose sum is σ = 152034480. Its totient is φ = 151947768.

The previous prime is 151991087. The next prime is 151991137. The reversal of 151991123 is 321199151.

151991123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 151991123 - 2¹⁸ = 151728979 is a prime.

It is a super-2 number, since 2×151991123² = 46202602941602258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151991123.

It is not an unprimeable number, because it can be changed into a prime (151991173) 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, 15908 + ... + 23601.

It is an arithmetic number, because the mean of its divisors is an integer number (38008620).

Almost surely, 2^151991123 is an apocalyptic number.

151991123 is a deficient number, since it is larger than the sum of its proper divisors (43357).

151991123 is an equidigital number, since it uses as much as digits as its factorization.

151991123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43356.

The product of its digits is 2430, while the sum is 32.

The square root of 151991123 is about 12328.4679907927. The cubic root of 151991123 is about 533.6699403310.

The spelling of 151991123 in words is "one hundred fifty-one million, nine hundred ninety-one thousand, one hundred twenty-three".