1961925839 has 2 divisors, whose sum is σ = 1961925840. Its totient is φ = 1961925838.

The previous prime is 1961925803. The next prime is 1961925877. The reversal of 1961925839 is 9385291691.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9385291691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961925839 - 2⁸ = 1961925583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961975839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980962919 + 980962920.

It is an arithmetic number, because the mean of its divisors is an integer number (980962920).

Almost surely, 2^1961925839 is an apocalyptic number.

1961925839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961925839 is an equidigital number, since it uses as much as digits as its factorization.

1961925839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The square root of 1961925839 is about 44293.6320366709. The cubic root of 1961925839 is about 1251.8746993164.

The spelling of 1961925839 in words is "one billion, nine hundred sixty-one million, nine hundred twenty-five thousand, eight hundred thirty-nine".