90181313 has 2 divisors, whose sum is σ = 90181314. Its totient is φ = 90181312.

The previous prime is 90181309. The next prime is 90181319. The reversal of 90181313 is 31318109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63473089 + 26708224 = 7967^2 + 5168^2 .

It is a cyclic number.

It is not a de Polignac number, because 90181313 - 2² = 90181309 is a prime.

It is not a weakly prime, because it can be changed into another prime (90181319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45090656 + 45090657.

It is an arithmetic number, because the mean of its divisors is an integer number (45090657).

Almost surely, 2^90181313 is an apocalyptic number.

It is an amenable number.

90181313 is a deficient number, since it is larger than the sum of its proper divisors (1).

90181313 is an equidigital number, since it uses as much as digits as its factorization.

90181313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 90181313 is about 9496.3842066336. The cubic root of 90181313 is about 448.4412123987.

The spelling of 90181313 in words is "ninety million, one hundred eighty-one thousand, three hundred thirteen".