123149381 has 2 divisors, whose sum is σ = 123149382. Its totient is φ = 123149380.

The previous prime is 123149371. The next prime is 123149443. The reversal of 123149381 is 183941321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73376356 + 49773025 = 8566^2 + 7055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123149381 is a prime.

It is a super-2 number, since 2×123149381² = 30331540081366322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123149311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61574690 + 61574691.

It is an arithmetic number, because the mean of its divisors is an integer number (61574691).

Almost surely, 2^123149381 is an apocalyptic number.

It is an amenable number.

123149381 is a deficient number, since it is larger than the sum of its proper divisors (1).

123149381 is an equidigital number, since it uses as much as digits as its factorization.

123149381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 123149381 is about 11097.2690784715. The cubic root of 123149381 is about 497.5202298113.

The spelling of 123149381 in words is "one hundred twenty-three million, one hundred forty-nine thousand, three hundred eighty-one".