2501531 has 4 divisors (see below), whose sum is σ = 2504712. Its totient is φ = 2498352.

The previous prime is 2501507. The next prime is 2501563. The reversal of 2501531 is 1351052.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2501531 - 2¹⁸ = 2239387 is a prime.

It is a super-2 number, since 2×2501531² = 12515314687922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2501501) 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, 551 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (626178).

2^2501531 is an apocalyptic number.

2501531 is a deficient number, since it is larger than the sum of its proper divisors (3181).

2501531 is a wasteful number, since it uses less digits than its factorization.

2501531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 2501531 is about 1581.6229006941. The cubic root of 2501531 is about 135.7485803319.

Adding to 2501531 its reverse (1351052), we get a palindrome (3852583).

The spelling of 2501531 in words is "two million, five hundred one thousand, five hundred thirty-one".