123981761 has 2 divisors, whose sum is σ = 123981762. Its totient is φ = 123981760.

The previous prime is 123981751. The next prime is 123981763. The reversal of 123981761 is 167189321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122434225 + 1547536 = 11065^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 123981761 - 2²⁶ = 56872897 is a prime.

It is a super-2 number, since 2×123981761² = 30742954121322242, which contains 22 as substring.

Together with 123981763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123981763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61990880 + 61990881.

It is an arithmetic number, because the mean of its divisors is an integer number (61990881).

Almost surely, 2^123981761 is an apocalyptic number.

It is an amenable number.

123981761 is a deficient number, since it is larger than the sum of its proper divisors (1).

123981761 is an equidigital number, since it uses as much as digits as its factorization.

123981761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 123981761 is about 11134.7097402671. The cubic root of 123981761 is about 498.6386447880.

The spelling of 123981761 in words is "one hundred twenty-three million, nine hundred eighty-one thousand, seven hundred sixty-one".