1230123157 has 2 divisors, whose sum is σ = 1230123158. Its totient is φ = 1230123156.

The previous prime is 1230123119. The next prime is 1230123187. The reversal of 1230123157 is 7513210321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219825476 + 10297681 = 34926^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230123157 - 2⁷ = 1230123029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230123107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615061578 + 615061579.

It is an arithmetic number, because the mean of its divisors is an integer number (615061579).

Almost surely, 2^1230123157 is an apocalyptic number.

It is an amenable number.

1230123157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230123157 is an equidigital number, since it uses as much as digits as its factorization.

1230123157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1230123157 is about 35073.1115956369. Note that the first 3 decimals coincide. The cubic root of 1230123157 is about 1071.4770287934.

Adding to 1230123157 its reverse (7513210321), we get a palindrome (8743333478).

The spelling of 1230123157 in words is "one billion, two hundred thirty million, one hundred twenty-three thousand, one hundred fifty-seven".