52131509 has 2 divisors, whose sum is σ = 52131510. Its totient is φ = 52131508.

The previous prime is 52131487. The next prime is 52131517. The reversal of 52131509 is 90513125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37332100 + 14799409 = 6110^2 + 3847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52131509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52139509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26065754 + 26065755.

It is an arithmetic number, because the mean of its divisors is an integer number (26065755).

Almost surely, 2^52131509 is an apocalyptic number.

It is an amenable number.

52131509 is a deficient number, since it is larger than the sum of its proper divisors (1).

52131509 is an equidigital number, since it uses as much as digits as its factorization.

52131509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 52131509 is about 7220.2153014990. The cubic root of 52131509 is about 373.5655038824.

The spelling of 52131509 in words is "fifty-two million, one hundred thirty-one thousand, five hundred nine".