123251987 has 2 divisors, whose sum is σ = 123251988. Its totient is φ = 123251986.

The previous prime is 123251951. The next prime is 123252007. The reversal of 123251987 is 789152321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123251987 - 2¹⁶ = 123186451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123251987.

It is not a weakly prime, because it can be changed into another prime (123254987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61625993 + 61625994.

It is an arithmetic number, because the mean of its divisors is an integer number (61625994).

Almost surely, 2^123251987 is an apocalyptic number.

123251987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123251987 is an equidigital number, since it uses as much as digits as its factorization.

123251987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 123251987 is about 11101.8911452058. The cubic root of 123251987 is about 497.6583666260.

The spelling of 123251987 in words is "one hundred twenty-three million, two hundred fifty-one thousand, nine hundred eighty-seven".