261333250 has 32 divisors (see below), whose sum is σ = 496139904. Its totient is φ = 103054000.

The previous prime is 261333223. The next prime is 261333283. The reversal of 261333250 is 52333162.

It is a happy number.

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

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, 10389 + ... + 25111.

It is an arithmetic number, because the mean of its divisors is an integer number (15504372).

Almost surely, 2^261333250 is an apocalyptic number.

261333250 is a deficient number, since it is larger than the sum of its proper divisors (234806654).

261333250 is a wasteful number, since it uses less digits than its factorization.

261333250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14811 (or 14801 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 261333250 is about 16165.8049598528. The cubic root of 261333250 is about 639.3395285978.

The spelling of 261333250 in words is "two hundred sixty-one million, three hundred thirty-three thousand, two hundred fifty".