157311551 has 4 divisors (see below), whose sum is σ = 157361952. Its totient is φ = 157261152.

The previous prime is 157311533. The next prime is 157311563. The reversal of 157311551 is 155113751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155113751 = 13 ⋅11931827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157311551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157311521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20186 + ... + 26871.

It is an arithmetic number, because the mean of its divisors is an integer number (39340488).

Almost surely, 2^157311551 is an apocalyptic number.

157311551 is a deficient number, since it is larger than the sum of its proper divisors (50401).

157311551 is an equidigital number, since it uses as much as digits as its factorization.

157311551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50400.

The product of its digits is 2625, while the sum is 29.

The square root of 157311551 is about 12542.3901629634. The cubic root of 157311551 is about 539.8256764696.

It can be divided in two parts, 157311 and 551, that multiplied together give a triangular number (86678361 = T₁₃₁₆₆).

The spelling of 157311551 in words is "one hundred fifty-seven million, three hundred eleven thousand, five hundred fifty-one".