72155051 has 4 divisors (see below), whose sum is σ = 72356400. Its totient is φ = 71953704.

The previous prime is 72155033. The next prime is 72155081. The reversal of 72155051 is 15055127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15055127 = 53 ⋅284059.

It is a cyclic number.

It is not a de Polignac number, because 72155051 - 2²⁶ = 5046187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72155051.

It is not an unprimeable number, because it can be changed into a prime (72155081) 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 3 ways as a sum of consecutive naturals, for example, 100136 + ... + 100853.

It is an arithmetic number, because the mean of its divisors is an integer number (18089100).

Almost surely, 2^72155051 is an apocalyptic number.

72155051 is a deficient number, since it is larger than the sum of its proper divisors (201349).

72155051 is a wasteful number, since it uses less digits than its factorization.

72155051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201348.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 72155051 is about 8494.4129285078. The cubic root of 72155051 is about 416.3151792770.

The spelling of 72155051 in words is "seventy-two million, one hundred fifty-five thousand, fifty-one".