72151331 has 8 divisors (see below), whose sum is σ = 82673760. Its totient is φ = 61682688.

The previous prime is 72151327. The next prime is 72151337. The reversal of 72151331 is 13315127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72151331 - 2² = 72151327 is a prime.

It is a super-2 number, since 2×72151331² = 10411629130143122, 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 = 72151297 and 72151306.

It is not an unprimeable number, because it can be changed into a prime (72151337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10526 + ... + 15971.

It is an arithmetic number, because the mean of its divisors is an integer number (10334220).

Almost surely, 2^72151331 is an apocalyptic number.

72151331 is a deficient number, since it is larger than the sum of its proper divisors (10522429).

72151331 is a wasteful number, since it uses less digits than its factorization.

72151331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26893.

The product of its digits is 630, while the sum is 23.

The square root of 72151331 is about 8494.1939582282. The cubic root of 72151331 is about 416.3080246886.

Adding to 72151331 its reverse (13315127), we get a palindrome (85466458).

The spelling of 72151331 in words is "seventy-two million, one hundred fifty-one thousand, three hundred thirty-one".