11403890521 has 9 divisors (see below), whose sum is σ = 11923837429. Its totient is φ = 10905719836.

The previous prime is 11403890501. The next prime is 11403890527. The reversal of 11403890521 is 12509830411.

The square root of 11403890521 is 106789.

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

It is a de Polignac number, because none of the positive numbers 2^k-11403890521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11403890527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2453826 + ... + 2458468.

Almost surely, 2^11403890521 is an apocalyptic number.

11403890521 is the 106789-th square number.

11403890521 is the 53395-th centered octagonal number.

It is an amenable number.

11403890521 is a deficient number, since it is larger than the sum of its proper divisors (519946908).

11403890521 is an frugal number, since it uses more digits than its factorization.

11403890521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9332 (or 4666 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 11403890521 in words is "eleven billion, four hundred three million, eight hundred ninety thousand, five hundred twenty-one".