72187469 has 2 divisors, whose sum is σ = 72187470. Its totient is φ = 72187468.

The previous prime is 72187463. The next prime is 72187471. The reversal of 72187469 is 96478127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52027369 + 20160100 = 7213^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 72187469 - 2²⁴ = 55410253 is a prime.

It is a super-2 number, since 2×72187469² = 10422061361251922, which contains 22 as substring.

Together with 72187471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72187463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36093734 + 36093735.

It is an arithmetic number, because the mean of its divisors is an integer number (36093735).

Almost surely, 2^72187469 is an apocalyptic number.

It is an amenable number.

72187469 is a deficient number, since it is larger than the sum of its proper divisors (1).

72187469 is an equidigital number, since it uses as much as digits as its factorization.

72187469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 72187469 is about 8496.3209096644. The cubic root of 72187469 is about 416.3775176470.

The spelling of 72187469 in words is "seventy-two million, one hundred eighty-seven thousand, four hundred sixty-nine".