157673891 has 2 divisors, whose sum is σ = 157673892. Its totient is φ = 157673890.

The previous prime is 157673863. The next prime is 157673897. The reversal of 157673891 is 198376751.

It is a strong prime.

It is an emirp because it is prime and its reverse (198376751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157673891 is a prime.

It is a super-2 number, since 2×157673891² = 49722111806159762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157673897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78836945 + 78836946.

It is an arithmetic number, because the mean of its divisors is an integer number (78836946).

Almost surely, 2^157673891 is an apocalyptic number.

157673891 is a deficient number, since it is larger than the sum of its proper divisors (1).

157673891 is an equidigital number, since it uses as much as digits as its factorization.

157673891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 157673891 is about 12556.8264700919. The cubic root of 157673891 is about 540.2398237440.

The spelling of 157673891 in words is "one hundred fifty-seven million, six hundred seventy-three thousand, eight hundred ninety-one".