261391246 has 16 divisors (see below), whose sum is σ = 418381200. Its totient is φ = 122119488.

The previous prime is 261391241. The next prime is 261391267. The reversal of 261391246 is 642193162.

It is a happy number.

261391246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261391241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44341 + ... + 49888.

It is an arithmetic number, because the mean of its divisors is an integer number (26148825).

Almost surely, 2^261391246 is an apocalyptic number.

261391246 is a deficient number, since it is larger than the sum of its proper divisors (156989954).

261391246 is a wasteful number, since it uses less digits than its factorization.

261391246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94323.

The product of its digits is 15552, while the sum is 34.

The square root of 261391246 is about 16167.5986466760. The cubic root of 261391246 is about 639.3868199301.

The spelling of 261391246 in words is "two hundred sixty-one million, three hundred ninety-one thousand, two hundred forty-six".