80615021 has 2 divisors, whose sum is σ = 80615022. Its totient is φ = 80615020.

The previous prime is 80615009. The next prime is 80615027. The reversal of 80615021 is 12051608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 1155625 = 8914^2 + 1075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80615021 is a prime.

It is a super-2 number, since 2×80615021² = 12997563221660882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80615027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40307510 + 40307511.

It is an arithmetic number, because the mean of its divisors is an integer number (40307511).

Almost surely, 2^80615021 is an apocalyptic number.

It is an amenable number.

80615021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80615021 is an equidigital number, since it uses as much as digits as its factorization.

80615021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 80615021 is about 8978.5868041691. The cubic root of 80615021 is about 431.9883059392.

Adding to 80615021 its reverse (12051608), we get a palindrome (92666629).

The spelling of 80615021 in words is "eighty million, six hundred fifteen thousand, twenty-one".