157231087 has 4 divisors (see below), whose sum is σ = 169325800. Its totient is φ = 145136376.

The previous prime is 157231037. The next prime is 157231097. The reversal of 157231087 is 780132751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780132751 = 59 ⋅13222589.

It is a cyclic number.

It is not a de Polignac number, because 157231087 - 2⁷ = 157230959 is a prime.

It is a super-2 number, since 2×157231087² = 49443229438403138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157231037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6047337 + ... + 6047362.

It is an arithmetic number, because the mean of its divisors is an integer number (42331450).

Almost surely, 2^157231087 is an apocalyptic number.

157231087 is a deficient number, since it is larger than the sum of its proper divisors (12094713).

157231087 is a wasteful number, since it uses less digits than its factorization.

157231087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12094712.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 157231087 is about 12539.1820706137. The cubic root of 157231087 is about 539.7336214766.

The spelling of 157231087 in words is "one hundred fifty-seven million, two hundred thirty-one thousand, eighty-seven".