136973531 has 8 divisors (see below), whose sum is σ = 141803904. Its totient is φ = 132168960.

The previous prime is 136973521. The next prime is 136973537. The reversal of 136973531 is 135379631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136973531 is a prime.

It is a super-2 number, since 2×136973531² = 37523496389215922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136973537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4685 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (17725488).

Almost surely, 2^136973531 is an apocalyptic number.

136973531 is a deficient number, since it is larger than the sum of its proper divisors (4830373).

136973531 is a wasteful number, since it uses less digits than its factorization.

136973531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12901.

The product of its digits is 51030, while the sum is 38.

The square root of 136973531 is about 11703.5691564582. The cubic root of 136973531 is about 515.4804715761.

The spelling of 136973531 in words is "one hundred thirty-six million, nine hundred seventy-three thousand, five hundred thirty-one".