157431621 has 8 divisors (see below), whose sum is σ = 210585024. Its totient is φ = 104616320.

The previous prime is 157431601. The next prime is 157431641. The reversal of 157431621 is 126134751.

It is an interprime number because it is at equal distance from previous prime (157431601) and next prime (157431641).

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 157431621 - 2²² = 153237317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157431601) 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 7 ways as a sum of consecutive naturals, for example, 83436 + ... + 85301.

It is an arithmetic number, because the mean of its divisors is an integer number (26323128).

Almost surely, 2^157431621 is an apocalyptic number.

It is an amenable number.

157431621 is a deficient number, since it is larger than the sum of its proper divisors (53153403).

157431621 is a wasteful number, since it uses less digits than its factorization.

157431621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169051.

The product of its digits is 5040, while the sum is 30.

The square root of 157431621 is about 12547.1758176890. The cubic root of 157431621 is about 539.9629844312.

The spelling of 157431621 in words is "one hundred fifty-seven million, four hundred thirty-one thousand, six hundred twenty-one".