129123461 has 2 divisors, whose sum is σ = 129123462. Its totient is φ = 129123460.

The previous prime is 129123439. The next prime is 129123469. The reversal of 129123461 is 164321921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109851361 + 19272100 = 10481^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 129123461 - 2²² = 124929157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129123469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64561730 + 64561731.

It is an arithmetic number, because the mean of its divisors is an integer number (64561731).

Almost surely, 2^129123461 is an apocalyptic number.

It is an amenable number.

129123461 is a deficient number, since it is larger than the sum of its proper divisors (1).

129123461 is an equidigital number, since it uses as much as digits as its factorization.

129123461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 129123461 is about 11363.2504592656. The cubic root of 129123461 is about 505.4385772707.

The spelling of 129123461 in words is "one hundred twenty-nine million, one hundred twenty-three thousand, four hundred sixty-one".