158681257 has 6 divisors (see below), whose sum is σ = 184588458. Its totient is φ = 136012464.

The previous prime is 158681227. The next prime is 158681323. The reversal of 158681257 is 752186851.

It can be written as a sum of positive squares in only one way, i.e., 154032921 + 4648336 = 12411^2 + 2156^2 .

It is not a de Polignac number, because 158681257 - 2⁷ = 158681129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158681227) 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 in 5 ways as a sum of consecutive naturals, for example, 1619148 + ... + 1619245.

It is an arithmetic number, because the mean of its divisors is an integer number (30764743).

Almost surely, 2^158681257 is an apocalyptic number.

It is an amenable number.

158681257 is a deficient number, since it is larger than the sum of its proper divisors (25907201).

158681257 is an equidigital number, since it uses as much as digits as its factorization.

158681257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238407 (or 3238400 counting only the distinct ones).

The product of its digits is 134400, while the sum is 43.

The square root of 158681257 is about 12596.8748902257. The cubic root of 158681257 is about 541.3878986978.

The spelling of 158681257 in words is "one hundred fifty-eight million, six hundred eighty-one thousand, two hundred fifty-seven".