1261042095 has 16 divisors (see below), whose sum is σ = 2018161152. Its totient is φ = 672391200.

The previous prime is 1261042067. The next prime is 1261042109. The reversal of 1261042095 is 5902401621.

It is not a de Polignac number, because 1261042095 - 2⁷ = 1261041967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76870 + ... + 91820.

It is an arithmetic number, because the mean of its divisors is an integer number (126135072).

Almost surely, 2^1261042095 is an apocalyptic number.

1261042095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261042095 is a deficient number, since it is larger than the sum of its proper divisors (757119057).

1261042095 is a wasteful number, since it uses less digits than its factorization.

1261042095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20582.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1261042095 is about 35511.1545151661. The cubic root of 1261042095 is about 1080.3799803205.

The spelling of 1261042095 in words is "one billion, two hundred sixty-one million, forty-two thousand, ninety-five".