158681481 has 16 divisors (see below), whose sum is σ = 247425024. Its totient is φ = 88565904.

The previous prime is 158681477. The next prime is 158681489. The reversal of 158681481 is 184186851.

It is not a de Polignac number, because 158681481 - 2² = 158681477 is a prime.

It is a super-2 number, since 2×158681481² = 50359624824706722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (158681489) 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 15 ways as a sum of consecutive naturals, for example, 86961 + ... + 88766.

It is an arithmetic number, because the mean of its divisors is an integer number (15464064).

Almost surely, 2^158681481 is an apocalyptic number.

It is an amenable number.

158681481 is a deficient number, since it is larger than the sum of its proper divisors (88743543).

158681481 is a wasteful number, since it uses less digits than its factorization.

158681481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175780.

The product of its digits is 61440, while the sum is 42.

The square root of 158681481 is about 12596.8837813167. The cubic root of 158681481 is about 541.3881534450.

The spelling of 158681481 in words is "one hundred fifty-eight million, six hundred eighty-one thousand, four hundred eighty-one".