123152891 has 2 divisors, whose sum is σ = 123152892. Its totient is φ = 123152890.

The previous prime is 123152819. The next prime is 123152929. The reversal of 123152891 is 198251321.

It is a happy number.

Together with previous prime (123152819) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123152891 is a prime.

It is not a weakly prime, because it can be changed into another prime (113152891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61576445 + 61576446.

It is an arithmetic number, because the mean of its divisors is an integer number (61576446).

Almost surely, 2^123152891 is an apocalyptic number.

123152891 is a deficient number, since it is larger than the sum of its proper divisors (1).

123152891 is an equidigital number, since it uses as much as digits as its factorization.

123152891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 123152891 is about 11097.4272243615. The cubic root of 123152891 is about 497.5249565353.

The spelling of 123152891 in words is "one hundred twenty-three million, one hundred fifty-two thousand, eight hundred ninety-one".