1930617391 has 2 divisors, whose sum is σ = 1930617392. Its totient is φ = 1930617390.

The previous prime is 1930617343. The next prime is 1930617431. The reversal of 1930617391 is 1937160391.

It is an a-pointer prime, because the next prime (1930617431) can be obtained adding 1930617391 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1930617391 - 2¹¹ = 1930615343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1930617331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965308695 + 965308696.

It is an arithmetic number, because the mean of its divisors is an integer number (965308696).

Almost surely, 2^1930617391 is an apocalyptic number.

1930617391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930617391 is an equidigital number, since it uses as much as digits as its factorization.

1930617391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1930617391 is about 43938.7914148762. The cubic root of 1930617391 is about 1245.1798132785.

The spelling of 1930617391 in words is "one billion, nine hundred thirty million, six hundred seventeen thousand, three hundred ninety-one".