1261346636 has 12 divisors (see below), whose sum is σ = 2408025480. Its totient is φ = 573339360.

The previous prime is 1261346617. The next prime is 1261346641. The reversal of 1261346636 is 6366431621.

It is a super-2 number, since 2×1261346636² = 3181990672297032992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261346636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14333441 + ... + 14333528.

It is an arithmetic number, because the mean of its divisors is an integer number (200668790).

Almost surely, 2^1261346636 is an apocalyptic number.

It is an amenable number.

1261346636 is a deficient number, since it is larger than the sum of its proper divisors (1146678844).

1261346636 is a wasteful number, since it uses less digits than its factorization.

1261346636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28666984 (or 28666982 counting only the distinct ones).

The product of its digits is 93312, while the sum is 38.

The square root of 1261346636 is about 35515.4422188433. The cubic root of 1261346636 is about 1080.4669437186.

The spelling of 1261346636 in words is "one billion, two hundred sixty-one million, three hundred forty-six thousand, six hundred thirty-six".