90639123189121 has 32 divisors (see below), whose sum is σ = 99086951376000. Its totient is φ = 82411869969408.

The previous prime is 90639123189113. The next prime is 90639123189227. The reversal of 90639123189121 is 12198132193609.

It is a cyclic number.

It is not a de Polignac number, because 90639123189121 - 2³ = 90639123189113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90639123139121) 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 in 31 ways as a sum of consecutive naturals, for example, 425611215 + ... + 425824123.

It is an arithmetic number, because the mean of its divisors is an integer number (3096467230500).

Almost surely, 2^{90639123189121} is an apocalyptic number.

It is an amenable number.

90639123189121 is a deficient number, since it is larger than the sum of its proper divisors (8447828186879).

90639123189121 is a wasteful number, since it uses less digits than its factorization.

90639123189121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214833.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 90639123189121 in words is "ninety trillion, six hundred thirty-nine billion, one hundred twenty-three million, one hundred eighty-nine thousand, one hundred twenty-one".