157978631 has 8 divisors (see below), whose sum is σ = 165397680. Its totient is φ = 150691072.

The previous prime is 157978553. The next prime is 157978661. The reversal of 157978631 is 136879751.

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

It is a cyclic number.

It is not a de Polignac number, because 157978631 - 2¹⁰ = 157977607 is a prime.

It is a super-2 number, since 2×157978631² = 49914495705268322, 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 (157978661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30410 + ... + 35223.

It is an arithmetic number, because the mean of its divisors is an integer number (20674710).

Almost surely, 2^157978631 is an apocalyptic number.

157978631 is a deficient number, since it is larger than the sum of its proper divisors (7419049).

157978631 is an equidigital number, since it uses as much as digits as its factorization.

157978631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65745.

The product of its digits is 317520, while the sum is 47.

The square root of 157978631 is about 12568.9550480539. The cubic root of 157978631 is about 540.5876444547.

The spelling of 157978631 in words is "one hundred fifty-seven million, nine hundred seventy-eight thousand, six hundred thirty-one".