90970246187521 has 8 divisors (see below), whose sum is σ = 94117560431400. Its totient is φ = 87823625890560.

The previous prime is 90970246187503. The next prime is 90970246187549. The reversal of 90970246187521 is 12578164207909.

It can be written as a sum of positive squares in 4 ways, for example, as 22923651258225 + 68046594929296 = 4787865^2 + 8249036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90970246187521 - 2³¹ = 90968098703873 is a prime.

It is a super-2 number, since 2×90970246187521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90970246187521.

It is not an unprimeable number, because it can be changed into a prime (90970246187591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173220006 + ... + 173744383.

It is an arithmetic number, because the mean of its divisors is an integer number (11764695053925).

Almost surely, 2^{90970246187521} is an apocalyptic number.

It is an amenable number.

90970246187521 is a deficient number, since it is larger than the sum of its proper divisors (3147314243879).

90970246187521 is a wasteful number, since it uses less digits than its factorization.

90970246187521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346973459.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 90970246187521 in words is "ninety trillion, nine hundred seventy billion, two hundred forty-six million, one hundred eighty-seven thousand, five hundred twenty-one".