157828381 has 2 divisors, whose sum is σ = 157828382. Its totient is φ = 157828380.

The previous prime is 157828379. The next prime is 157828441. The reversal of 157828381 is 183828751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130736356 + 27092025 = 11434^2 + 5205^2 .

It is a cyclic number.

It is not a de Polignac number, because 157828381 - 2¹ = 157828379 is a prime.

It is a super-2 number, since 2×157828381² = 49819595698162322, which contains 22 as substring.

Together with 157828379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157828331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78914190 + 78914191.

It is an arithmetic number, because the mean of its divisors is an integer number (78914191).

Almost surely, 2^157828381 is an apocalyptic number.

It is an amenable number.

157828381 is a deficient number, since it is larger than the sum of its proper divisors (1).

157828381 is an equidigital number, since it uses as much as digits as its factorization.

157828381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 43.

The square root of 157828381 is about 12562.9765979246. The cubic root of 157828381 is about 540.4162097558.

The spelling of 157828381 in words is "one hundred fifty-seven million, eight hundred twenty-eight thousand, three hundred eighty-one".