261367250 has 16 divisors (see below), whose sum is σ = 489279960. Its totient is φ = 104546800.

The previous prime is 261367241. The next prime is 261367261. The reversal of 261367250 is 52763162.

261367250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 90307009 + 171060241 = 9503^2 + 13079^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522485 + ... + 522984.

Almost surely, 2^261367250 is an apocalyptic number.

261367250 is a deficient number, since it is larger than the sum of its proper divisors (227912710).

261367250 is a wasteful number, since it uses less digits than its factorization.

261367250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045486 (or 1045476 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 261367250 is about 16166.8565280948. The cubic root of 261367250 is about 639.3672538634.

The spelling of 261367250 in words is "two hundred sixty-one million, three hundred sixty-seven thousand, two hundred fifty".