1291949356 has 12 divisors (see below), whose sum is σ = 2275885360. Its totient is φ = 641696400.

The previous prime is 1291949339. The next prime is 1291949369. The reversal of 1291949356 is 6539491921.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 1068891 + ... + 1070098.

Almost surely, 2^1291949356 is an apocalyptic number.

It is an amenable number.

1291949356 is a deficient number, since it is larger than the sum of its proper divisors (983936004).

1291949356 is a wasteful number, since it uses less digits than its factorization.

1291949356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139144 (or 2139142 counting only the distinct ones).

The product of its digits is 524880, while the sum is 49.

The square root of 1291949356 is about 35943.6970274344. The cubic root of 1291949356 is about 1089.1352892818.

The spelling of 1291949356 in words is "one billion, two hundred ninety-one million, nine hundred forty-nine thousand, three hundred fifty-six".