157929493 has 2 divisors, whose sum is σ = 157929494. Its totient is φ = 157929492.

The previous prime is 157929481. The next prime is 157929503. The reversal of 157929493 is 394929751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157929489 + 4 = 12567^2 + 2^2 .

It is an emirp because it is prime and its reverse (394929751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157929493 - 2⁵ = 157929461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157929403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78964746 + 78964747.

It is an arithmetic number, because the mean of its divisors is an integer number (78964747).

Almost surely, 2^157929493 is an apocalyptic number.

It is an amenable number.

157929493 is a deficient number, since it is larger than the sum of its proper divisors (1).

157929493 is an equidigital number, since it uses as much as digits as its factorization.

157929493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 157929493 is about 12567.0001591470. Note that the first 3 decimals coincide. The cubic root of 157929493 is about 540.5315901430.

The spelling of 157929493 in words is "one hundred fifty-seven million, nine hundred twenty-nine thousand, four hundred ninety-three".