72146989 has 2 divisors, whose sum is σ = 72146990. Its totient is φ = 72146988.

The previous prime is 72146953. The next prime is 72146993. The reversal of 72146989 is 98964127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 6812100 = 8083^2 + 2610^2 .

It is an emirp because it is prime and its reverse (98964127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72146989 is a prime.

It is a super-2 number, since 2×72146989² = 10410376043532242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72146489) 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 as a sum of consecutive naturals, namely, 36073494 + 36073495.

It is an arithmetic number, because the mean of its divisors is an integer number (36073495).

Almost surely, 2^72146989 is an apocalyptic number.

It is an amenable number.

72146989 is a deficient number, since it is larger than the sum of its proper divisors (1).

72146989 is an equidigital number, since it uses as much as digits as its factorization.

72146989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 72146989 is about 8493.9383680363. The cubic root of 72146989 is about 416.2996735111.

The spelling of 72146989 in words is "seventy-two million, one hundred forty-six thousand, nine hundred eighty-nine".