1261609002 has 12 divisors (see below), whose sum is σ = 2733486210. Its totient is φ = 420536328.

The previous prime is 1261608989. The next prime is 1261609003. The reversal of 1261609002 is 2009061621.

It can be written as a sum of positive squares in only one way, i.e., 1256773401 + 4835601 = 35451^2 + 2199^2 .

It is not an unprimeable number, because it can be changed into a prime (1261609003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35044677 + ... + 35044712.

Almost surely, 2^1261609002 is an apocalyptic number.

1261609002 is an abundant number, since it is smaller than the sum of its proper divisors (1471877208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261609002 is a wasteful number, since it uses less digits than its factorization.

1261609002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70089397 (or 70089394 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1261609002 is about 35519.1357158363. The cubic root of 1261609002 is about 1080.5418525844.

The spelling of 1261609002 in words is "one billion, two hundred sixty-one million, six hundred nine thousand, two".