1919259157 has 2 divisors, whose sum is σ = 1919259158. Its totient is φ = 1919259156.

The previous prime is 1919259071. The next prime is 1919259187. The reversal of 1919259157 is 7519529191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1744649361 + 174609796 = 41769^2 + 13214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919259157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1919259157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919259187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959629578 + 959629579.

It is an arithmetic number, because the mean of its divisors is an integer number (959629579).

Almost surely, 2^1919259157 is an apocalyptic number.

It is an amenable number.

1919259157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919259157 is an equidigital number, since it uses as much as digits as its factorization.

1919259157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 49.

The square root of 1919259157 is about 43809.3501093089. The cubic root of 1919259157 is about 1242.7331226877.

The spelling of 1919259157 in words is "one billion, nine hundred nineteen million, two hundred fifty-nine thousand, one hundred fifty-seven".