157990541 has 2 divisors, whose sum is σ = 157990542. Its totient is φ = 157990540.

The previous prime is 157990499. The next prime is 157990559. The reversal of 157990541 is 145099751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147525316 + 10465225 = 12146^2 + 3235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157990541 is a prime.

It is a super-2 number, since 2×157990541² = 49922022090945362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157090541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78995270 + 78995271.

It is an arithmetic number, because the mean of its divisors is an integer number (78995271).

Almost surely, 2^157990541 is an apocalyptic number.

It is an amenable number.

157990541 is a deficient number, since it is larger than the sum of its proper divisors (1).

157990541 is an equidigital number, since it uses as much as digits as its factorization.

157990541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 41.

The square root of 157990541 is about 12569.4288255274. The cubic root of 157990541 is about 540.6012290705.

The spelling of 157990541 in words is "one hundred fifty-seven million, nine hundred ninety thousand, five hundred forty-one".