157193691 has 8 divisors (see below), whose sum is σ = 209651520. Its totient is φ = 104765832.

The previous prime is 157193689. The next prime is 157193693. The reversal of 157193691 is 196391751.

It is an interprime number because it is at equal distance from previous prime (157193689) and next prime (157193693).

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

It is not a de Polignac number, because 157193691 - 2¹ = 157193689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157193693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11980 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (26206440).

Almost surely, 2^157193691 is an apocalyptic number.

157193691 is a deficient number, since it is larger than the sum of its proper divisors (52457829).

157193691 is an equidigital number, since it uses as much as digits as its factorization.

157193691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14985.

The product of its digits is 51030, while the sum is 42.

The square root of 157193691 is about 12537.6908160953. The cubic root of 157193691 is about 539.6908278211.

The spelling of 157193691 in words is "one hundred fifty-seven million, one hundred ninety-three thousand, six hundred ninety-one".