521145402 has 16 divisors (see below), whose sum is σ = 1075913472. Its totient is φ = 168111360.

The previous prime is 521145367. The next prime is 521145409. The reversal of 521145402 is 204541125.

It is not an unprimeable number, because it can be changed into a prime (521145409) 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, 1400743 + ... + 1401114.

It is an arithmetic number, because the mean of its divisors is an integer number (67244592).

Almost surely, 2^521145402 is an apocalyptic number.

521145402 is an abundant number, since it is smaller than the sum of its proper divisors (554768070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521145402 is a wasteful number, since it uses less digits than its factorization.

521145402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801893.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 521145402 is about 22828.6092874708. The cubic root of 521145402 is about 804.7351478798.

Adding to 521145402 its reverse (204541125), we get a palindrome (725686527).

The spelling of 521145402 in words is "five hundred twenty-one million, one hundred forty-five thousand, four hundred two".