158772691 has 36 divisors (see below), whose sum is σ = 206809680. Its totient is φ = 121413600.

The previous prime is 158772671. The next prime is 158772701. The reversal of 158772691 is 196277851.

It is a happy number.

It is not a de Polignac number, because 158772691 - 2⁷ = 158772563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158772631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 361450 + ... + 361888.

Almost surely, 2^158772691 is an apocalyptic number.

158772691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

158772691 is a deficient number, since it is larger than the sum of its proper divisors (48036989).

158772691 is a wasteful number, since it uses less digits than its factorization.

158772691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 518 counting only the distinct ones).

The product of its digits is 211680, while the sum is 46.

The square root of 158772691 is about 12600.5036010471. The cubic root of 158772691 is about 541.4918634158.

The spelling of 158772691 in words is "one hundred fifty-eight million, seven hundred seventy-two thousand, six hundred ninety-one".