72169231 has 2 divisors, whose sum is σ = 72169232. Its totient is φ = 72169230.

The previous prime is 72169169. The next prime is 72169241. The reversal of 72169231 is 13296127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72169231 - 2¹⁹ = 71644943 is a prime.

It is a super-2 number, since 2×72169231² = 10416795806262722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72169193 and 72169202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72169241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084615 + 36084616.

It is an arithmetic number, because the mean of its divisors is an integer number (36084616).

Almost surely, 2^72169231 is an apocalyptic number.

72169231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72169231 is an equidigital number, since it uses as much as digits as its factorization.

72169231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 72169231 is about 8495.2475537797. The cubic root of 72169231 is about 416.3424490823.

The spelling of 72169231 in words is "seventy-two million, one hundred sixty-nine thousand, two hundred thirty-one".