1800019157 has 2 divisors, whose sum is σ = 1800019158. Its totient is φ = 1800019156.

The previous prime is 1800019129. The next prime is 1800019159. The reversal of 1800019157 is 7519100081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1144198276 + 655820881 = 33826^2 + 25609^2 .

It is an emirp because it is prime and its reverse (7519100081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800019157 - 2⁸ = 1800018901 is a prime.

Together with 1800019159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800019159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900009578 + 900009579.

It is an arithmetic number, because the mean of its divisors is an integer number (900009579).

Almost surely, 2^1800019157 is an apocalyptic number.

It is an amenable number.

1800019157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800019157 is an equidigital number, since it uses as much as digits as its factorization.

1800019157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 1800019157 is about 42426.6326380023. The cubic root of 1800019157 is about 1216.4447145343. Note that the first 3 decimals are identical.

The spelling of 1800019157 in words is "one billion, eight hundred million, nineteen thousand, one hundred fifty-seven".