123949961 has 2 divisors, whose sum is σ = 123949962. Its totient is φ = 123949960.

The previous prime is 123949937. The next prime is 123949981. The reversal of 123949961 is 169949321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 43309561 = 8980^2 + 6581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123949961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123949981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61974980 + 61974981.

It is an arithmetic number, because the mean of its divisors is an integer number (61974981).

Almost surely, 2^123949961 is an apocalyptic number.

It is an amenable number.

123949961 is a deficient number, since it is larger than the sum of its proper divisors (1).

123949961 is an equidigital number, since it uses as much as digits as its factorization.

123949961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 123949961 is about 11133.2816815169. The cubic root of 123949961 is about 498.5960093103.

The spelling of 123949961 in words is "one hundred twenty-three million, nine hundred forty-nine thousand, nine hundred sixty-one".