90645949 has 2 divisors, whose sum is σ = 90645950. Its totient is φ = 90645948.

The previous prime is 90645901. The next prime is 90646009. The reversal of 90645949 is 94954609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59397849 + 31248100 = 7707^2 + 5590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90645949 is a prime.

It is a super-2 number, since 2×90645949² = 16433376140221202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90645899 and 90645908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90645349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45322974 + 45322975.

It is an arithmetic number, because the mean of its divisors is an integer number (45322975).

Almost surely, 2^90645949 is an apocalyptic number.

It is an amenable number.

90645949 is a deficient number, since it is larger than the sum of its proper divisors (1).

90645949 is an equidigital number, since it uses as much as digits as its factorization.

90645949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 90645949 is about 9520.8166141356. The cubic root of 90645949 is about 449.2100527910.

The spelling of 90645949 in words is "ninety million, six hundred forty-five thousand, nine hundred forty-nine".