90121234031 has 2 divisors, whose sum is σ = 90121234032. Its totient is φ = 90121234030.

The previous prime is 90121233997. The next prime is 90121234051. The reversal of 90121234031 is 13043212109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90121234031 - 2¹⁸ = 90120971887 is a prime.

It is a super-2 number, since 2×90121234031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90121234051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45060617015 + 45060617016.

It is an arithmetic number, because the mean of its divisors is an integer number (45060617016).

Almost surely, 2^90121234031 is an apocalyptic number.

90121234031 is a deficient number, since it is larger than the sum of its proper divisors (1).

90121234031 is an equidigital number, since it uses as much as digits as its factorization.

90121234031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 90121234031 in words is "ninety billion, one hundred twenty-one million, two hundred thirty-four thousand, thirty-one".