1261251115 has 8 divisors (see below), whose sum is σ = 1579305888. Its totient is φ = 965131200.

The previous prime is 1261251113. The next prime is 1261251127. The reversal of 1261251115 is 5111521621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261251115 - 2¹ = 1261251113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261251115.

It is not an unprimeable number, because it can be changed into a prime (1261251113) 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, 5483586 + ... + 5483815.

It is an arithmetic number, because the mean of its divisors is an integer number (197413236).

Almost surely, 2^1261251115 is an apocalyptic number.

1261251115 is a deficient number, since it is larger than the sum of its proper divisors (318054773).

1261251115 is a wasteful number, since it uses less digits than its factorization.

1261251115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10967429.

The product of its digits is 600, while the sum is 25.

The square root of 1261251115 is about 35514.0974121545. The cubic root of 1261251115 is about 1080.4396686658.

Adding to 1261251115 its reverse (5111521621), we get a palindrome (6372772736).

The spelling of 1261251115 in words is "one billion, two hundred sixty-one million, two hundred fifty-one thousand, one hundred fifteen".