156790993 has 2 divisors, whose sum is σ = 156790994. Its totient is φ = 156790992.

The previous prime is 156790981. The next prime is 156790999. The reversal of 156790993 is 399097651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118635664 + 38155329 = 10892^2 + 6177^2 .

It is a cyclic number.

It is not a de Polignac number, because 156790993 - 2²¹ = 154693841 is a prime.

It is not a weakly prime, because it can be changed into another prime (156790999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78395496 + 78395497.

It is an arithmetic number, because the mean of its divisors is an integer number (78395497).

Almost surely, 2^156790993 is an apocalyptic number.

It is an amenable number.

156790993 is a deficient number, since it is larger than the sum of its proper divisors (1).

156790993 is an equidigital number, since it uses as much as digits as its factorization.

156790993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 459270, while the sum is 49.

The square root of 156790993 is about 12521.6210212576. The cubic root of 156790993 is about 539.2295746431.

The spelling of 156790993 in words is "one hundred fifty-six million, seven hundred ninety thousand, nine hundred ninety-three".