157937991 has 8 divisors (see below), whose sum is σ = 211008000. Its totient is φ = 105079992.

The previous prime is 157937981. The next prime is 157938023. The reversal of 157937991 is 199739751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157937991 - 2¹⁴ = 157921607 is a prime.

It is a super-2 number, since 2×157937991² = 49888818002232162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157937911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51255 + ... + 54248.

It is an arithmetic number, because the mean of its divisors is an integer number (26376000).

Almost surely, 2^157937991 is an apocalyptic number.

157937991 is a deficient number, since it is larger than the sum of its proper divisors (53070009).

157937991 is a wasteful number, since it uses less digits than its factorization.

157937991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106005.

The product of its digits is 535815, while the sum is 51.

The square root of 157937991 is about 12567.3382623370. The cubic root of 157937991 is about 540.5412850918.

The spelling of 157937991 in words is "one hundred fifty-seven million, nine hundred thirty-seven thousand, nine hundred ninety-one".