81012413 has 2 divisors, whose sum is σ = 81012414. Its totient is φ = 81012412.

The previous prime is 81012377. The next prime is 81012419. The reversal of 81012413 is 31421018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 29789764 = 7157^2 + 5458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81012413 is a prime.

It is a super-2 number, since 2×81012413² = 13126022120165138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81012419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40506206 + 40506207.

It is an arithmetic number, because the mean of its divisors is an integer number (40506207).

Almost surely, 2^81012413 is an apocalyptic number.

It is an amenable number.

81012413 is a deficient number, since it is larger than the sum of its proper divisors (1).

81012413 is an equidigital number, since it uses as much as digits as its factorization.

81012413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81012413 is about 9000.6895846929. The cubic root of 81012413 is about 432.6969719928.

The spelling of 81012413 in words is "eighty-one million, twelve thousand, four hundred thirteen".