1919025139 has 2 divisors, whose sum is σ = 1919025140. Its totient is φ = 1919025138.

The previous prime is 1919025109. The next prime is 1919025167. The reversal of 1919025139 is 9315209191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1919025139 - 2⁵ = 1919025107 is a prime.

It is a super-2 number, since 2×1919025139² = 7365314968227938642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1919025109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959512569 + 959512570.

It is an arithmetic number, because the mean of its divisors is an integer number (959512570).

Almost surely, 2^1919025139 is an apocalyptic number.

1919025139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919025139 is an equidigital number, since it uses as much as digits as its factorization.

1919025139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 1919025139 is about 43806.6791596898. The cubic root of 1919025139 is about 1242.6826112287.

The spelling of 1919025139 in words is "one billion, nine hundred nineteen million, twenty-five thousand, one hundred thirty-nine".