157866281 has 2 divisors, whose sum is σ = 157866282. Its totient is φ = 157866280.

The previous prime is 157866263. The next prime is 157866323. The reversal of 157866281 is 182668751.

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., 148962025 + 8904256 = 12205^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 157866281 - 2⁶ = 157866217 is a prime.

It is a super-2 number, since 2×157866281² = 49843525353541922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157866251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78933140 + 78933141.

It is an arithmetic number, because the mean of its divisors is an integer number (78933141).

Almost surely, 2^157866281 is an apocalyptic number.

It is an amenable number.

157866281 is a deficient number, since it is larger than the sum of its proper divisors (1).

157866281 is an equidigital number, since it uses as much as digits as its factorization.

157866281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 157866281 is about 12564.4849078663. The cubic root of 157866281 is about 540.4594637743.

The spelling of 157866281 in words is "one hundred fifty-seven million, eight hundred sixty-six thousand, two hundred eighty-one".