1261977682 has 16 divisors (see below), whose sum is σ = 2277253440. Its totient is φ = 512381808.

The previous prime is 1261977653. The next prime is 1261977697. The reversal of 1261977682 is 2867791621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2371873 + ... + 2372404.

It is an arithmetic number, because the mean of its divisors is an integer number (142328340).

Almost surely, 2^1261977682 is an apocalyptic number.

1261977682 is a deficient number, since it is larger than the sum of its proper divisors (1015275758).

1261977682 is a wasteful number, since it uses less digits than its factorization.

1261977682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744305.

The product of its digits is 508032, while the sum is 49.

The square root of 1261977682 is about 35524.3252152662. The cubic root of 1261977682 is about 1080.6470979153.

The spelling of 1261977682 in words is "one billion, two hundred sixty-one million, nine hundred seventy-seven thousand, six hundred eighty-two".