157457381 has 2 divisors, whose sum is σ = 157457382. Its totient is φ = 157457380.

The previous prime is 157457369. The next prime is 157457411. The reversal of 157457381 is 183754751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100681156 + 56776225 = 10034^2 + 7535^2 .

It is a cyclic number.

It is not a de Polignac number, because 157457381 - 2¹⁸ = 157195237 is a prime.

It is a super-2 number, since 2×157457381² = 49585653662758322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157453381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78728690 + 78728691.

It is an arithmetic number, because the mean of its divisors is an integer number (78728691).

Almost surely, 2^157457381 is an apocalyptic number.

It is an amenable number.

157457381 is a deficient number, since it is larger than the sum of its proper divisors (1).

157457381 is an equidigital number, since it uses as much as digits as its factorization.

157457381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 157457381 is about 12548.2023015251. The cubic root of 157457381 is about 539.9924335931.

The spelling of 157457381 in words is "one hundred fifty-seven million, four hundred fifty-seven thousand, three hundred eighty-one".