1261333402 has 12 divisors (see below), whose sum is σ = 2200898250. Its totient is φ = 540571416.

The previous prime is 1261333331. The next prime is 1261333421. The reversal of 1261333402 is 2043331621.

It can be written as a sum of positive squares in only one way, i.e., 877996161 + 383337241 = 29631^2 + 19579^2 .

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 5 ways as a sum of consecutive naturals, for example, 6435277 + ... + 6435472.

Almost surely, 2^1261333402 is an apocalyptic number.

1261333402 is a deficient number, since it is larger than the sum of its proper divisors (939564848).

1261333402 is a wasteful number, since it uses less digits than its factorization.

1261333402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870765 (or 12870758 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1261333402 is about 35515.2559050333. The cubic root of 1261333402 is about 1080.4631649663.

The spelling of 1261333402 in words is "one billion, two hundred sixty-one million, three hundred thirty-three thousand, four hundred two".