157649923 has 2 divisors, whose sum is σ = 157649924. Its totient is φ = 157649922.

The previous prime is 157649903. The next prime is 157649939. The reversal of 157649923 is 329946751.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (329946751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157649923 is a prime.

It is not a weakly prime, because it can be changed into another prime (157649903) 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 as a sum of consecutive naturals, namely, 78824961 + 78824962.

It is an arithmetic number, because the mean of its divisors is an integer number (78824962).

Almost surely, 2^157649923 is an apocalyptic number.

157649923 is a deficient number, since it is larger than the sum of its proper divisors (1).

157649923 is an equidigital number, since it uses as much as digits as its factorization.

157649923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 157649923 is about 12555.8720525498. The cubic root of 157649923 is about 540.2124484143.

The spelling of 157649923 in words is "one hundred fifty-seven million, six hundred forty-nine thousand, nine hundred twenty-three".