261375906 has 32 divisors (see below), whose sum is σ = 574783488. Its totient is φ = 78578640.

The previous prime is 261375899. The next prime is 261375929. The reversal of 261375906 is 609573162.

261375906 = T₁₉₆₅ + T₁₉₆₆ + ... + T₂₀₉₁.

261375906 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, 7210 + ... + 23973.

It is an arithmetic number, because the mean of its divisors is an integer number (17961984).

Almost surely, 2^261375906 is an apocalyptic number.

261375906 is an abundant number, since it is smaller than the sum of its proper divisors (313407582).

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

261375906 is a wasteful number, since it uses less digits than its factorization.

261375906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31326.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 261375906 is about 16167.1242340745. The cubic root of 261375906 is about 639.3743120059.

The spelling of 261375906 in words is "two hundred sixty-one million, three hundred seventy-five thousand, nine hundred six".