261611430 has 32 divisors (see below), whose sum is σ = 655167744. Its totient is φ = 66729696.

The previous prime is 261611429. The next prime is 261611473. The reversal of 261611430 is 34116162.

It is a self number, because there is not a number n which added to its sum of digits gives 261611430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188884 + ... + 190263.

It is an arithmetic number, because the mean of its divisors is an integer number (20473992).

Almost surely, 2^261611430 is an apocalyptic number.

261611430 is an abundant number, since it is smaller than the sum of its proper divisors (393556314).

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

261611430 is a wasteful number, since it uses less digits than its factorization.

261611430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379180.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261611430 is about 16174.4066351752. The cubic root of 261611430 is about 639.5662995908.

Adding to 261611430 its reverse (34116162), we get a palindrome (295727592).

The spelling of 261611430 in words is "two hundred sixty-one million, six hundred eleven thousand, four hundred thirty".