73156253 has 4 divisors (see below), whose sum is σ = 77459580. Its totient is φ = 68852928.

The previous prime is 73156231. The next prime is 73156301. The reversal of 73156253 is 35265137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35265137 = 61 ⋅578117.

It can be written as a sum of positive squares in 2 ways, for example, as 30880249 + 42276004 = 5557^2 + 6502^2 .

It is a cyclic number.

It is not a de Polignac number, because 73156253 - 2²⁰ = 72107677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73156453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151638 + ... + 2151671.

It is an arithmetic number, because the mean of its divisors is an integer number (19364895).

Almost surely, 2^73156253 is an apocalyptic number.

It is an amenable number.

73156253 is a deficient number, since it is larger than the sum of its proper divisors (4303327).

73156253 is a wasteful number, since it uses less digits than its factorization.

73156253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303326.

The product of its digits is 18900, while the sum is 32.

The square root of 73156253 is about 8553.1428726521. The cubic root of 73156253 is about 418.2318963099.

The spelling of 73156253 in words is "seventy-three million, one hundred fifty-six thousand, two hundred fifty-three".