1261231802 has 16 divisors (see below), whose sum is σ = 2057273640. Its totient is φ = 577479168.

The previous prime is 1261231801. The next prime is 1261231813. The reversal of 1261231802 is 2081321621.

It can be written as a sum of positive squares in 4 ways, for example, as 1175872681 + 85359121 = 34291^2 + 9239^2 .

It is not an unprimeable number, because it can be changed into a prime (1261231801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500027 + ... + 502542.

Almost surely, 2^1261231802 is an apocalyptic number.

1261231802 is a deficient number, since it is larger than the sum of its proper divisors (796041838).

1261231802 is a wasteful number, since it uses less digits than its factorization.

1261231802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002625.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1261231802 is about 35513.8255050058. The cubic root of 1261231802 is about 1080.4341538671.

The spelling of 1261231802 in words is "one billion, two hundred sixty-one million, two hundred thirty-one thousand, eight hundred two".