1920378931 has 2 divisors, whose sum is σ = 1920378932. Its totient is φ = 1920378930.

The previous prime is 1920378907. The next prime is 1920378947. The reversal of 1920378931 is 1398730291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920378931 - 2²¹ = 1918281779 is a prime.

It is a super-2 number, since 2×1920378931² = 7375710477257405522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1920378631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960189465 + 960189466.

It is an arithmetic number, because the mean of its divisors is an integer number (960189466).

Almost surely, 2^1920378931 is an apocalyptic number.

1920378931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920378931 is an equidigital number, since it uses as much as digits as its factorization.

1920378931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1920378931 is about 43822.1283257671. The cubic root of 1920378931 is about 1242.9747627475.

The spelling of 1920378931 in words is "one billion, nine hundred twenty million, three hundred seventy-eight thousand, nine hundred thirty-one".