521161445 has 16 divisors (see below), whose sum is σ = 718693248. Its totient is φ = 355389120.

The previous prime is 521161423. The next prime is 521161447. The reversal of 521161445 is 544161125.

It is not a de Polignac number, because 521161445 - 2⁸ = 521161189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521161447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34799 + ... + 47468.

It is an arithmetic number, because the mean of its divisors is an integer number (44918328).

Almost surely, 2^521161445 is an apocalyptic number.

It is an amenable number.

521161445 is a deficient number, since it is larger than the sum of its proper divisors (197531803).

521161445 is a wasteful number, since it uses less digits than its factorization.

521161445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82460.

The product of its digits is 4800, while the sum is 29.

The square root of 521161445 is about 22828.9606640337. The cubic root of 521161445 is about 804.7434054815.

The spelling of 521161445 in words is "five hundred twenty-one million, one hundred sixty-one thousand, four hundred forty-five".