521131465 has 4 divisors (see below), whose sum is σ = 625357764. Its totient is φ = 416905168.

The previous prime is 521131463. The next prime is 521131469. The reversal of 521131465 is 564131125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182277001 + 338854464 = 13501^2 + 18408^2 .

It is a cyclic number.

It is not a de Polignac number, because 521131465 - 2¹ = 521131463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521131463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52113142 + ... + 52113151.

It is an arithmetic number, because the mean of its divisors is an integer number (156339441).

Almost surely, 2^521131465 is an apocalyptic number.

It is an amenable number.

521131465 is a deficient number, since it is larger than the sum of its proper divisors (104226299).

521131465 is a wasteful number, since it uses less digits than its factorization.

521131465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104226298.

The product of its digits is 3600, while the sum is 28.

The square root of 521131465 is about 22828.3040324944. The cubic root of 521131465 is about 804.7279741341.

The spelling of 521131465 in words is "five hundred twenty-one million, one hundred thirty-one thousand, four hundred sixty-five".