152438991 has 4 divisors (see below), whose sum is σ = 203251992. Its totient is φ = 101625992.

The previous prime is 152438981. The next prime is 152439013. The reversal of 152438991 is 199834251.

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 152438991 - 2⁵ = 152438959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152438981) 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, 25406496 + ... + 25406501.

It is an arithmetic number, because the mean of its divisors is an integer number (50812998).

Almost surely, 2^152438991 is an apocalyptic number.

152438991 is a deficient number, since it is larger than the sum of its proper divisors (50813001).

152438991 is an equidigital number, since it uses as much as digits as its factorization.

152438991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50813000.

The product of its digits is 77760, while the sum is 42.

The square root of 152438991 is about 12346.6186059180. The cubic root of 152438991 is about 534.1936097460.

The spelling of 152438991 in words is "one hundred fifty-two million, four hundred thirty-eight thousand, nine hundred ninety-one".