521404545 has 16 divisors (see below), whose sum is σ = 835297920. Its totient is φ = 277732224.

The previous prime is 521404529. The next prime is 521404547. The reversal of 521404545 is 545404125.

It is not a de Polignac number, because 521404545 - 2⁴ = 521404529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521404547) 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, 9349 + ... + 33618.

It is an arithmetic number, because the mean of its divisors is an integer number (52206120).

Almost surely, 2^521404545 is an apocalyptic number.

It is an amenable number.

521404545 is a deficient number, since it is larger than the sum of its proper divisors (313893375).

521404545 is a wasteful number, since it uses less digits than its factorization.

521404545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43784.

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 521404545 is about 22834.2844205813. The cubic root of 521404545 is about 804.8685124027.

The spelling of 521404545 in words is "five hundred twenty-one million, four hundred four thousand, five hundred forty-five".