1391968851 has 32 divisors (see below), whose sum is σ = 2357956608. Its totient is φ = 710536320.

The previous prime is 1391968849. The next prime is 1391968889. The reversal of 1391968851 is 1588691931.

It is not a de Polignac number, because 1391968851 - 2¹ = 1391968849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391968794 and 1391968803.

It is not an unprimeable number, because it can be changed into a prime (1391968841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73776 + ... + 90701.

It is an arithmetic number, because the mean of its divisors is an integer number (73686144).

Almost surely, 2^1391968851 is an apocalyptic number.

1391968851 is a deficient number, since it is larger than the sum of its proper divisors (965987757).

1391968851 is a wasteful number, since it uses less digits than its factorization.

1391968851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164531.

The product of its digits is 466560, while the sum is 51.

The square root of 1391968851 is about 37309.0987696031. The cubic root of 1391968851 is about 1116.5457058353.

The spelling of 1391968851 in words is "one billion, three hundred ninety-one million, nine hundred sixty-eight thousand, eight hundred fifty-one".