1261130690 has 8 divisors (see below), whose sum is σ = 2270035260. Its totient is φ = 504452272.

The previous prime is 1261130683. The next prime is 1261130797. The reversal of 1261130690 is 960311621.

It can be written as a sum of positive squares in 2 ways, for example, as 1135892209 + 125238481 = 33703^2 + 11191^2 .

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

It is a super-2 number, since 2×1261130690² = 3180901234519752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63056525 + ... + 63056544.

Almost surely, 2^1261130690 is an apocalyptic number.

1261130690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261130690 is a deficient number, since it is larger than the sum of its proper divisors (1008904570).

1261130690 is a wasteful number, since it uses less digits than its factorization.

1261130690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126113076.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1261130690 is about 35512.4019182032. The cubic root of 1261130690 is about 1080.4052805658.

The spelling of 1261130690 in words is "one billion, two hundred sixty-one million, one hundred thirty thousand, six hundred ninety".