72621131 has 4 divisors (see below), whose sum is σ = 79223064. Its totient is φ = 66019200.

The previous prime is 72621089. The next prime is 72621139. The reversal of 72621131 is 13112627.

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 72621131 - 2⁶ = 72621067 is a prime.

It is a super-2 number, since 2×72621131² = 10547657335438322, 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 = 72621097 and 72621106.

It is not an unprimeable number, because it can be changed into a prime (72621139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3300950 + ... + 3300971.

It is an arithmetic number, because the mean of its divisors is an integer number (19805766).

Almost surely, 2^72621131 is an apocalyptic number.

72621131 is a deficient number, since it is larger than the sum of its proper divisors (6601933).

72621131 is a wasteful number, since it uses less digits than its factorization.

72621131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601932.

The product of its digits is 504, while the sum is 23.

The square root of 72621131 is about 8521.8032716087. The cubic root of 72621131 is about 417.2096414186.

Adding to 72621131 its reverse (13112627), we get a palindrome (85733758).

The spelling of 72621131 in words is "seventy-two million, six hundred twenty-one thousand, one hundred thirty-one".