261440502 has 16 divisors (see below), whose sum is σ = 525592560. Its totient is φ = 86694912.

The previous prime is 261440447. The next prime is 261440503. The reversal of 261440502 is 205044162.

It is a super-2 number, since 2×261440502² = 136702272172024008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111727 + ... + 114042.

It is an arithmetic number, because the mean of its divisors is an integer number (32849535).

Almost surely, 2^261440502 is an apocalyptic number.

261440502 is an abundant number, since it is smaller than the sum of its proper divisors (264152058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261440502 is a wasteful number, since it uses less digits than its factorization.

261440502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225967.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 261440502 is about 16169.1218685493. The cubic root of 261440502 is about 639.4269789634.

Adding to 261440502 its reverse (205044162), we get a palindrome (466484664).

The spelling of 261440502 in words is "two hundred sixty-one million, four hundred forty thousand, five hundred two".