261193450 has 24 divisors (see below), whose sum is σ = 555223392. Its totient is φ = 89551920.

The previous prime is 261193391. The next prime is 261193483. The reversal of 261193450 is 54391162.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372784 + ... + 373483.

It is an arithmetic number, because the mean of its divisors is an integer number (23134308).

Almost surely, 2^261193450 is an apocalyptic number.

261193450 is an abundant number, since it is smaller than the sum of its proper divisors (294029942).

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

261193450 is a wasteful number, since it uses less digits than its factorization.

261193450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746286 (or 746281 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 261193450 is about 16161.4804396132. The cubic root of 261193450 is about 639.2255035503.

The spelling of 261193450 in words is "two hundred sixty-one million, one hundred ninety-three thousand, four hundred fifty".