72113431 has 4 divisors (see below), whose sum is σ = 77660632. Its totient is φ = 66566232.

The previous prime is 72113413. The next prime is 72113449. The reversal of 72113431 is 13431127.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72113413) and next prime (72113449).

It is a cyclic number.

It is not a de Polignac number, because 72113431 - 2¹¹ = 72111383 is a prime.

It is a super-2 number, since 2×72113431² = 10400693861183522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72113411) 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, 2773581 + ... + 2773606.

It is an arithmetic number, because the mean of its divisors is an integer number (19415158).

Almost surely, 2^72113431 is an apocalyptic number.

72113431 is a deficient number, since it is larger than the sum of its proper divisors (5547201).

72113431 is a wasteful number, since it uses less digits than its factorization.

72113431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5547200.

The product of its digits is 504, while the sum is 22.

The square root of 72113431 is about 8491.9627295461. The cubic root of 72113431 is about 416.2351184909.

Adding to 72113431 its reverse (13431127), we get a palindrome (85544558).

The spelling of 72113431 in words is "seventy-two million, one hundred thirteen thousand, four hundred thirty-one".