80725969 has 2 divisors, whose sum is σ = 80725970. Its totient is φ = 80725968.

The previous prime is 80725949. The next prime is 80725973. The reversal of 80725969 is 96952708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58982400 + 21743569 = 7680^2 + 4663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80725969 is a prime.

It is a super-2 number, since 2×80725969² = 13033364141977922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80725919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40362984 + 40362985.

It is an arithmetic number, because the mean of its divisors is an integer number (40362985).

Almost surely, 2^80725969 is an apocalyptic number.

It is an amenable number.

80725969 is a deficient number, since it is larger than the sum of its proper divisors (1).

80725969 is an equidigital number, since it uses as much as digits as its factorization.

80725969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 80725969 is about 8984.7631577020. The cubic root of 80725969 is about 432.1863925463.

It can be divided in two parts, 8072 and 5969, that added together give a palindrome (14041).

The spelling of 80725969 in words is "eighty million, seven hundred twenty-five thousand, nine hundred sixty-nine".