90251213 has 4 divisors (see below), whose sum is σ = 97193628. Its totient is φ = 83308800.

The previous prime is 90251207. The next prime is 90251221. The reversal of 90251213 is 31215209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31215209 = 23 ⋅1357183.

It can be written as a sum of positive squares in 2 ways, for example, as 19909444 + 70341769 = 4462^2 + 8387^2 .

It is a cyclic number.

It is not a de Polignac number, because 90251213 - 2²⁴ = 73473997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90251713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3471188 + ... + 3471213.

It is an arithmetic number, because the mean of its divisors is an integer number (24298407).

Almost surely, 2^90251213 is an apocalyptic number.

It is an amenable number.

90251213 is a deficient number, since it is larger than the sum of its proper divisors (6942415).

90251213 is a wasteful number, since it uses less digits than its factorization.

90251213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942414.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 90251213 is about 9500.0638418907. The cubic root of 90251213 is about 448.5570455071.

The spelling of 90251213 in words is "ninety million, two hundred fifty-one thousand, two hundred thirteen".