131000521 has 6 divisors (see below), whose sum is σ = 139160030. Its totient is φ = 123294336.

The previous prime is 131000509. The next prime is 131000531. The reversal of 131000521 is 125000131.

It can be written as a sum of positive squares in 3 ways, for example, as 78074896 + 52925625 = 8836^2 + 7275^2 .

It is not a de Polignac number, because 131000521 - 2¹⁷ = 130869449 is a prime.

It is a super-2 number, since 2×131000521² = 34322273004542882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131000531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226356 + ... + 226933.

Almost surely, 2^131000521 is an apocalyptic number.

It is an amenable number.

131000521 is a deficient number, since it is larger than the sum of its proper divisors (8159509).

131000521 is an equidigital number, since it uses as much as digits as its factorization.

131000521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453323 (or 453306 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 131000521 is about 11445.5459022276. The cubic root of 131000521 is about 507.8759811025.

Adding to 131000521 its reverse (125000131), we get a palindrome (256000652).

The spelling of 131000521 in words is "one hundred thirty-one million, five hundred twenty-one", and thus it is an aban number.