19123157 has 2 divisors, whose sum is σ = 19123158. Its totient is φ = 19123156.

The previous prime is 19123133. The next prime is 19123171. The reversal of 19123157 is 75132191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 1069156 = 4249^2 + 1034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19123157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19123127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9561578 + 9561579.

It is an arithmetic number, because the mean of its divisors is an integer number (9561579).

Almost surely, 2^19123157 is an apocalyptic number.

It is an amenable number.

19123157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19123157 is an equidigital number, since it uses as much as digits as its factorization.

19123157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 19123157 is about 4373.0032014624. The cubic root of 19123157 is about 267.4154715891.

The spelling of 19123157 in words is "nineteen million, one hundred twenty-three thousand, one hundred fifty-seven".