135972291 has 32 divisors (see below), whose sum is σ = 224501760. Its totient is φ = 71282304.

The previous prime is 135972259. The next prime is 135972337. The reversal of 135972291 is 192279531.

135972291 = T₁₆₈₃ + T₁₆₈₄ + ... + T₁₇₇₃.

It is not a de Polignac number, because 135972291 - 2⁵ = 135972259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (135972241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45790 + ... + 48668.

It is an arithmetic number, because the mean of its divisors is an integer number (7015680).

Almost surely, 2^135972291 is an apocalyptic number.

135972291 is a deficient number, since it is larger than the sum of its proper divisors (88529469).

135972291 is a wasteful number, since it uses less digits than its factorization.

135972291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075.

The product of its digits is 34020, while the sum is 39.

The square root of 135972291 is about 11660.7157155982. The cubic root of 135972291 is about 514.2213904449.

The spelling of 135972291 in words is "one hundred thirty-five million, nine hundred seventy-two thousand, two hundred ninety-one".