136651531 has 4 divisors (see below), whose sum is σ = 136817200. Its totient is φ = 136485864.

The previous prime is 136651517. The next prime is 136651573. The reversal of 136651531 is 135156631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135156631 = 47 ⋅2875673.

It is a cyclic number.

It is not a de Polignac number, because 136651531 - 2⁹ = 136651019 is a prime.

It is a super-2 number, since 2×136651531² = 37347281849287922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136651493 and 136651502.

It is not an unprimeable number, because it can be changed into a prime (136652531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81591 + ... + 83248.

It is an arithmetic number, because the mean of its divisors is an integer number (34204300).

Almost surely, 2^136651531 is an apocalyptic number.

136651531 is a deficient number, since it is larger than the sum of its proper divisors (165669).

136651531 is an equidigital number, since it uses as much as digits as its factorization.

136651531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165668.

The product of its digits is 8100, while the sum is 31.

The square root of 136651531 is about 11689.8045749277. The cubic root of 136651531 is about 515.0762208486.

The spelling of 136651531 in words is "one hundred thirty-six million, six hundred fifty-one thousand, five hundred thirty-one".