1831243157 has 2 divisors, whose sum is σ = 1831243158. Its totient is φ = 1831243156.

The previous prime is 1831243153. The next prime is 1831243159. The reversal of 1831243157 is 7513421381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1593127396 + 238115761 = 39914^2 + 15431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831243157 - 2² = 1831243153 is a prime.

Together with 1831243159, 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 (1831243153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915621578 + 915621579.

It is an arithmetic number, because the mean of its divisors is an integer number (915621579).

Almost surely, 2^1831243157 is an apocalyptic number.

It is an amenable number.

1831243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831243157 is an equidigital number, since it uses as much as digits as its factorization.

1831243157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 1831243157 is about 42793.0269670188. The cubic root of 1831243157 is about 1223.4381109331.

The spelling of 1831243157 in words is "one billion, eight hundred thirty-one million, two hundred forty-three thousand, one hundred fifty-seven".