90213231137 has 2 divisors, whose sum is σ = 90213231138. Its totient is φ = 90213231136.

The previous prime is 90213231133. The next prime is 90213231217. The reversal of 90213231137 is 73113231209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63141135841 + 27072095296 = 251279^2 + 164536^2 .

It is a cyclic number.

It is not a de Polignac number, because 90213231137 - 2² = 90213231133 is a prime.

It is not a weakly prime, because it can be changed into another prime (90213231133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45106615568 + 45106615569.

It is an arithmetic number, because the mean of its divisors is an integer number (45106615569).

Almost surely, 2^90213231137 is an apocalyptic number.

It is an amenable number.

90213231137 is a deficient number, since it is larger than the sum of its proper divisors (1).

90213231137 is an equidigital number, since it uses as much as digits as its factorization.

90213231137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The spelling of 90213231137 in words is "ninety billion, two hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-seven".