1391312650 has 48 divisors (see below), whose sum is σ = 3185046144. Its totient is φ = 440326080.

The previous prime is 1391312647. The next prime is 1391312653. The reversal of 1391312650 is 562131931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1391312647) and next prime (1391312653).

It is not an unprimeable number, because it can be changed into a prime (1391312653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148342 + ... + 157441.

It is an arithmetic number, because the mean of its divisors is an integer number (66355128).

Almost surely, 2^1391312650 is an apocalyptic number.

1391312650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1391312650 is an abundant number, since it is smaller than the sum of its proper divisors (1793733494).

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

1391312650 is a wasteful number, since it uses less digits than its factorization.

1391312650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305815 (or 305810 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1391312650 is about 37300.3036180672. The cubic root of 1391312650 is about 1116.3702245206.

The spelling of 1391312650 in words is "one billion, three hundred ninety-one million, three hundred twelve thousand, six hundred fifty".