123491651 has 2 divisors, whose sum is σ = 123491652. Its totient is φ = 123491650.

The previous prime is 123491603. The next prime is 123491699. The reversal of 123491651 is 156194321.

It is a balanced prime because it is at equal distance from previous prime (123491603) and next prime (123491699).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123491651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123493651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61745825 + 61745826.

It is an arithmetic number, because the mean of its divisors is an integer number (61745826).

Almost surely, 2^123491651 is an apocalyptic number.

123491651 is a deficient number, since it is larger than the sum of its proper divisors (1).

123491651 is an equidigital number, since it uses as much as digits as its factorization.

123491651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 123491651 is about 11112.6797398287. The cubic root of 123491651 is about 497.9807240272.

The spelling of 123491651 in words is "one hundred twenty-three million, four hundred ninety-one thousand, six hundred fifty-one".