129540457 has 2 divisors, whose sum is σ = 129540458. Its totient is φ = 129540456.

The previous prime is 129540431. The next prime is 129540473. The reversal of 129540457 is 754045921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123409881 + 6130576 = 11109^2 + 2476^2 .

It is a cyclic number.

It is not a de Polignac number, because 129540457 - 2¹⁹ = 129016169 is a prime.

It is not a weakly prime, because it can be changed into another prime (129540407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64770228 + 64770229.

It is an arithmetic number, because the mean of its divisors is an integer number (64770229).

Almost surely, 2^129540457 is an apocalyptic number.

It is an amenable number.

129540457 is a deficient number, since it is larger than the sum of its proper divisors (1).

129540457 is an equidigital number, since it uses as much as digits as its factorization.

129540457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 129540457 is about 11381.5841164576. The cubic root of 129540457 is about 505.9820865202.

The spelling of 129540457 in words is "one hundred twenty-nine million, five hundred forty thousand, four hundred fifty-seven".