1261983802 has 4 divisors (see below), whose sum is σ = 1892975706. Its totient is φ = 630991900.

The previous prime is 1261983733. The next prime is 1261983817. The reversal of 1261983802 is 2083891621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 875035561 + 386948241 = 29581^2 + 19671^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315495949 + ... + 315495952.

Almost surely, 2^1261983802 is an apocalyptic number.

1261983802 is a deficient number, since it is larger than the sum of its proper divisors (630991904).

1261983802 is an equidigital number, since it uses as much as digits as its factorization.

1261983802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630991903.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1261983802 is about 35524.4113533215. The cubic root of 1261983802 is about 1080.6488447897.

The spelling of 1261983802 in words is "one billion, two hundred sixty-one million, nine hundred eighty-three thousand, eight hundred two".