157942123 has 2 divisors, whose sum is σ = 157942124. Its totient is φ = 157942122.

The previous prime is 157942063. The next prime is 157942163. The reversal of 157942123 is 321249751.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157942123 - 2¹³ = 157933931 is a prime.

It is not a weakly prime, because it can be changed into another prime (157942163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78971061 + 78971062.

It is an arithmetic number, because the mean of its divisors is an integer number (78971062).

Almost surely, 2^157942123 is an apocalyptic number.

157942123 is a deficient number, since it is larger than the sum of its proper divisors (1).

157942123 is an equidigital number, since it uses as much as digits as its factorization.

157942123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 157942123 is about 12567.5026556592. The cubic root of 157942123 is about 540.5459989611.

Subtracting 157942123 from its reverse (321249751), we obtain a triangular number (163307628 = T₁₈₀₇₂).

The spelling of 157942123 in words is "one hundred fifty-seven million, nine hundred forty-two thousand, one hundred twenty-three".