261050139 has 24 divisors (see below), whose sum is σ = 453623040. Its totient is φ = 141319728.

The previous prime is 261050107. The next prime is 261050143. The reversal of 261050139 is 931050162.

It is not a de Polignac number, because 261050139 - 2⁵ = 261050107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261050149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107847 + ... + 110240.

It is an arithmetic number, because the mean of its divisors is an integer number (18900960).

Almost surely, 2^261050139 is an apocalyptic number.

261050139 is a deficient number, since it is larger than the sum of its proper divisors (192572901).

261050139 is a wasteful number, since it uses less digits than its factorization.

261050139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218119 (or 218116 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 261050139 is about 16157.0461099794. The cubic root of 261050139 is about 639.1085725864.

The spelling of 261050139 in words is "two hundred sixty-one million, fifty thousand, one hundred thirty-nine".