25213531 has 8 divisors (see below), whose sum is σ = 29359584. Its totient is φ = 21203520.

The previous prime is 25213519. The next prime is 25213537. The reversal of 25213531 is 13531252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25213531 - 2¹⁵ = 25180763 is a prime.

It is a super-2 number, since 2×25213531² = 1271444290975922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25213537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33610 + ... + 34351.

It is an arithmetic number, because the mean of its divisors is an integer number (3669948).

Almost surely, 2^25213531 is an apocalyptic number.

25213531 is a deficient number, since it is larger than the sum of its proper divisors (4146053).

25213531 is an equidigital number, since it uses as much as digits as its factorization.

25213531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68021.

The product of its digits is 900, while the sum is 22.

The square root of 25213531 is about 5021.3076981997. The cubic root of 25213531 is about 293.2319060775.

Adding to 25213531 its reverse (13531252), we get a palindrome (38744783).

The spelling of 25213531 in words is "twenty-five million, two hundred thirteen thousand, five hundred thirty-one".