515252431 has 4 divisors (see below), whose sum is σ = 542371000. Its totient is φ = 488133864.

The previous prime is 515252407. The next prime is 515252449. The reversal of 515252431 is 134252515.

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

It is not a de Polignac number, because 515252431 - 2¹³ = 515244239 is a prime.

It is a super-2 number, since 2×515252431² = 530970135302819522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 515252431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515252461) 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, 13559256 + ... + 13559293.

It is an arithmetic number, because the mean of its divisors is an integer number (135592750).

Almost surely, 2^515252431 is an apocalyptic number.

515252431 is a deficient number, since it is larger than the sum of its proper divisors (27118569).

515252431 is a wasteful number, since it uses less digits than its factorization.

515252431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27118568.

The product of its digits is 6000, while the sum is 28.

The square root of 515252431 is about 22699.1724739031. The cubic root of 515252431 is about 801.6904001476.

It can be divided in two parts, 51525 and 2431, that added together give a triangular number (53956 = T₃₂₈).

The spelling of 515252431 in words is "five hundred fifteen million, two hundred fifty-two thousand, four hundred thirty-one".