261140425 has 48 divisors (see below), whose sum is σ = 403863040. Its totient is φ = 163088640.

The previous prime is 261140377. The next prime is 261140441. The reversal of 261140425 is 524041162.

It is a happy number.

It is not a de Polignac number, because 261140425 - 2¹⁵ = 261107657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 261140425.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 178999 + ... + 180451.

Almost surely, 2^261140425 is an apocalyptic number.

261140425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261140425 is a deficient number, since it is larger than the sum of its proper divisors (142722615).

261140425 is a wasteful number, since it uses less digits than its factorization.

261140425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 261140425 is about 16159.8398816325. The cubic root of 261140425 is about 639.1822441370.

Adding to 261140425 its reverse (524041162), we get a palindrome (785181587).

The spelling of 261140425 in words is "two hundred sixty-one million, one hundred forty thousand, four hundred twenty-five".