157239493 has 2 divisors, whose sum is σ = 157239494. Its totient is φ = 157239492.

The previous prime is 157239457. The next prime is 157239541. The reversal of 157239493 is 394932751.

157239493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139074849 + 18164644 = 11793^2 + 4262^2 .

It is an emirp because it is prime and its reverse (394932751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157239493 - 2²¹ = 155142341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157239403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78619746 + 78619747.

It is an arithmetic number, because the mean of its divisors is an integer number (78619747).

Almost surely, 2^157239493 is an apocalyptic number.

It is an amenable number.

157239493 is a deficient number, since it is larger than the sum of its proper divisors (1).

157239493 is an equidigital number, since it uses as much as digits as its factorization.

157239493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 157239493 is about 12539.5172554608. The cubic root of 157239493 is about 539.7432398459.

The spelling of 157239493 in words is "one hundred fifty-seven million, two hundred thirty-nine thousand, four hundred ninety-three".