123495721 has 2 divisors, whose sum is σ = 123495722. Its totient is φ = 123495720.

The previous prime is 123495703. The next prime is 123495727. The reversal of 123495721 is 127594321.

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., 74649600 + 48846121 = 8640^2 + 6989^2 .

It is a cyclic number.

It is not a de Polignac number, because 123495721 - 2⁹ = 123495209 is a prime.

It is not a weakly prime, because it can be changed into another prime (123495727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61747860 + 61747861.

It is an arithmetic number, because the mean of its divisors is an integer number (61747861).

Almost surely, 2^123495721 is an apocalyptic number.

It is an amenable number.

123495721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123495721 is an equidigital number, since it uses as much as digits as its factorization.

123495721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 123495721 is about 11112.8628624671. The cubic root of 123495721 is about 497.9861947324.

The spelling of 123495721 in words is "one hundred twenty-three million, four hundred ninety-five thousand, seven hundred twenty-one".