1261376115 has 32 divisors (see below), whose sum is σ = 2140909056. Its totient is φ = 631979520.

The previous prime is 1261376113. The next prime is 1261376159. The reversal of 1261376115 is 5116731621.

It is not a de Polignac number, because 1261376115 - 2¹ = 1261376113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261376113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141274 + ... + 149936.

It is an arithmetic number, because the mean of its divisors is an integer number (66903408).

Almost surely, 2^1261376115 is an apocalyptic number.

1261376115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261376115 is a deficient number, since it is larger than the sum of its proper divisors (879532941).

1261376115 is a wasteful number, since it uses less digits than its factorization.

1261376115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9259.

The product of its digits is 7560, while the sum is 33.

The square root of 1261376115 is about 35515.8572330727. The cubic root of 1261376115 is about 1080.4753608700.

The spelling of 1261376115 in words is "one billion, two hundred sixty-one million, three hundred seventy-six thousand, one hundred fifteen".