531513101 has 4 divisors (see below), whose sum is σ = 607443552. Its totient is φ = 455582652.

The previous prime is 531513043. The next prime is 531513107. The reversal of 531513101 is 101315135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101315135 = 5 ⋅20263027.

It is not a de Polignac number, because 531513101 - 2¹⁸ = 531250957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531513107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37965215 + ... + 37965228.

It is an arithmetic number, because the mean of its divisors is an integer number (151860888).

Almost surely, 2^531513101 is an apocalyptic number.

It is an amenable number.

531513101 is a deficient number, since it is larger than the sum of its proper divisors (75930451).

531513101 is an equidigital number, since it uses as much as digits as its factorization.

531513101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75930450.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 531513101 is about 23054.5678987918. The cubic root of 531513101 is about 810.0366294465.

Adding to 531513101 its reverse (101315135), we get a palindrome (632828236).

The spelling of 531513101 in words is "five hundred thirty-one million, five hundred thirteen thousand, one hundred one".