72020131 has 4 divisors (see below), whose sum is σ = 72042064. Its totient is φ = 71998200.

The previous prime is 72020111. The next prime is 72020159. The reversal of 72020131 is 13102027.

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: 13102027 = 191 ⋅68597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72020131 is a prime.

It is a super-2 number, since 2×72020131² = 10373798538514322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72020101) 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, 4935 + ... + 12976.

It is an arithmetic number, because the mean of its divisors is an integer number (18010516).

Almost surely, 2^72020131 is an apocalyptic number.

72020131 is a deficient number, since it is larger than the sum of its proper divisors (21933).

72020131 is a wasteful number, since it uses less digits than its factorization.

72020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21932.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 72020131 is about 8486.4675218845. The cubic root of 72020131 is about 416.0555333747.

Adding to 72020131 its reverse (13102027), we get a palindrome (85122158).

The spelling of 72020131 in words is "seventy-two million, twenty thousand, one hundred thirty-one".