90642613 has 2 divisors, whose sum is σ = 90642614. Its totient is φ = 90642612.

The previous prime is 90642593. The next prime is 90642619. The reversal of 90642613 is 31624609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58629649 + 32012964 = 7657^2 + 5658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90642613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90642619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45321306 + 45321307.

It is an arithmetic number, because the mean of its divisors is an integer number (45321307).

Almost surely, 2^90642613 is an apocalyptic number.

It is an amenable number.

90642613 is a deficient number, since it is larger than the sum of its proper divisors (1).

90642613 is an equidigital number, since it uses as much as digits as its factorization.

90642613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 90642613 is about 9520.6414174676. The cubic root of 90642613 is about 449.2045420350.

The spelling of 90642613 in words is "ninety million, six hundred forty-two thousand, six hundred thirteen".