93001211521 has 3 divisors (see below), whose sum is σ = 93001516483. Its totient is φ = 93000906560.

The previous prime is 93001211491. The next prime is 93001211579. The reversal of 93001211521 is 12511210039.

The square root of 93001211521 is 304961.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 82317921921 + 10683289600 = 286911^2 + 103360^2 .

It is not a de Polignac number, because 93001211521 - 2²³ = 92992822913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93001211591) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 152481 + ... + 457441.

Almost surely, 2^93001211521 is an apocalyptic number.

93001211521 is the 304961-st square number.

93001211521 is the 152481-st centered octagonal number.

It is an amenable number.

93001211521 is a deficient number, since it is larger than the sum of its proper divisors (304962).

93001211521 is an frugal number, since it uses more digits than its factorization.

93001211521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609922 (or 304961 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

Multiplying 93001211521 by its sum of digits (25), we get a square (2325030288025 = 1524805²).

The spelling of 93001211521 in words is "ninety-three billion, one million, two hundred eleven thousand, five hundred twenty-one".