72154631 has 4 divisors (see below), whose sum is σ = 72258264. Its totient is φ = 72051000.

The previous prime is 72154603. The next prime is 72154633. The reversal of 72154631 is 13645127.

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

It is a cyclic number.

It is not a de Polignac number, because 72154631 - 2¹⁸ = 71892487 is a prime.

It is a super-2 number, since 2×72154631² = 10412581549492322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72154594 and 72154603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72154633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50765 + ... + 52166.

It is an arithmetic number, because the mean of its divisors is an integer number (18064566).

Almost surely, 2^72154631 is an apocalyptic number.

72154631 is a deficient number, since it is larger than the sum of its proper divisors (103633).

72154631 is a wasteful number, since it uses less digits than its factorization.

72154631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103632.

The product of its digits is 5040, while the sum is 29.

The square root of 72154631 is about 8494.3882063395. The cubic root of 72154631 is about 416.3143715132.

Adding to 72154631 its reverse (13645127), we get a palindrome (85799758).

The spelling of 72154631 in words is "seventy-two million, one hundred fifty-four thousand, six hundred thirty-one".