261622250 has 32 divisors (see below), whose sum is σ = 492410880. Its totient is φ = 104082000.

The previous prime is 261622247. The next prime is 261622307. The reversal of 261622250 is 52226162.

261622250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 45011 + ... + 50489.

It is an arithmetic number, because the mean of its divisors is an integer number (15387840).

Almost surely, 2^261622250 is an apocalyptic number.

261622250 is a deficient number, since it is larger than the sum of its proper divisors (230788630).

261622250 is a wasteful number, since it uses less digits than its factorization.

261622250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687 (or 5677 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 261622250 is about 16174.7411107566. The cubic root of 261622250 is about 639.5751167539.

The spelling of 261622250 in words is "two hundred sixty-one million, six hundred twenty-two thousand, two hundred fifty".