1920031691 has 2 divisors, whose sum is σ = 1920031692. Its totient is φ = 1920031690.

The previous prime is 1920031679. The next prime is 1920031699. The reversal of 1920031691 is 1961300291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920031691 - 2⁶ = 1920031627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920031699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960015845 + 960015846.

It is an arithmetic number, because the mean of its divisors is an integer number (960015846).

Almost surely, 2^1920031691 is an apocalyptic number.

1920031691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920031691 is an equidigital number, since it uses as much as digits as its factorization.

1920031691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1920031691 is about 43818.1662213288. The cubic root of 1920031691 is about 1242.8998406290.

The spelling of 1920031691 in words is "one billion, nine hundred twenty million, thirty-one thousand, six hundred ninety-one".