123161887 has 2 divisors, whose sum is σ = 123161888. Its totient is φ = 123161886.

The previous prime is 123161861. The next prime is 123161893. The reversal of 123161887 is 788161321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123161887 - 2²³ = 114773279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123161807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61580943 + 61580944.

It is an arithmetic number, because the mean of its divisors is an integer number (61580944).

Almost surely, 2^123161887 is an apocalyptic number.

123161887 is a deficient number, since it is larger than the sum of its proper divisors (1).

123161887 is an equidigital number, since it uses as much as digits as its factorization.

123161887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 123161887 is about 11097.8325361306. The cubic root of 123161887 is about 497.5370705439.

The spelling of 123161887 in words is "one hundred twenty-three million, one hundred sixty-one thousand, eight hundred eighty-seven".