157982381 has 2 divisors, whose sum is σ = 157982382. Its totient is φ = 157982380.

The previous prime is 157982351. The next prime is 157982399. The reversal of 157982381 is 183289751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87254281 + 70728100 = 9341^2 + 8410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157982381 is a prime.

It is a super-2 number, since 2×157982381² = 49916865412858322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157982351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78991190 + 78991191.

It is an arithmetic number, because the mean of its divisors is an integer number (78991191).

Almost surely, 2^157982381 is an apocalyptic number.

It is an amenable number.

157982381 is a deficient number, since it is larger than the sum of its proper divisors (1).

157982381 is an equidigital number, since it uses as much as digits as its factorization.

157982381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 157982381 is about 12569.1042242476. The cubic root of 157982381 is about 540.5919218003.

The spelling of 157982381 in words is "one hundred fifty-seven million, nine hundred eighty-two thousand, three hundred eighty-one".