1291771652 has 12 divisors (see below), whose sum is σ = 2260861260. Its totient is φ = 645811296.

The previous prime is 1291771541. The next prime is 1291771669. The reversal of 1291771652 is 2561771921.

It can be written as a sum of positive squares in 2 ways, for example, as 435389956 + 856381696 = 20866^2 + 29264^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43058 + ... + 66614.

It is an arithmetic number, because the mean of its divisors is an integer number (188405105).

Almost surely, 2^1291771652 is an apocalyptic number.

It is an amenable number.

1291771652 is a deficient number, since it is larger than the sum of its proper divisors (969089608).

1291771652 is a wasteful number, since it uses less digits than its factorization.

1291771652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37270 (or 37268 counting only the distinct ones).

The product of its digits is 52920, while the sum is 41.

The square root of 1291771652 is about 35941.2249652123. The cubic root of 1291771652 is about 1089.0853511602.

The spelling of 1291771652 in words is "one billion, two hundred ninety-one million, seven hundred seventy-one thousand, six hundred fifty-two".