80690257 has 2 divisors, whose sum is σ = 80690258. Its totient is φ = 80690256.

The previous prime is 80690227. The next prime is 80690263. The reversal of 80690257 is 75209608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66732561 + 13957696 = 8169^2 + 3736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80690257 is a prime.

It is not a weakly prime, because it can be changed into another prime (80690227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40345128 + 40345129.

It is an arithmetic number, because the mean of its divisors is an integer number (40345129).

Almost surely, 2^80690257 is an apocalyptic number.

It is an amenable number.

80690257 is a deficient number, since it is larger than the sum of its proper divisors (1).

80690257 is an equidigital number, since it uses as much as digits as its factorization.

80690257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 80690257 is about 8982.7755732847. The cubic root of 80690257 is about 432.1226521450.

The spelling of 80690257 in words is "eighty million, six hundred ninety thousand, two hundred fifty-seven".