129474557 has 2 divisors, whose sum is σ = 129474558. Its totient is φ = 129474556.

The previous prime is 129474547. The next prime is 129474559. The reversal of 129474557 is 755474921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 60435076 = 8309^2 + 7774^2 .

It is an emirp because it is prime and its reverse (755474921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129474557 - 2¹² = 129470461 is a prime.

Together with 129474559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129474559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64737278 + 64737279.

It is an arithmetic number, because the mean of its divisors is an integer number (64737279).

Almost surely, 2^129474557 is an apocalyptic number.

It is an amenable number.

129474557 is a deficient number, since it is larger than the sum of its proper divisors (1).

129474557 is an equidigital number, since it uses as much as digits as its factorization.

129474557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 44.

The square root of 129474557 is about 11378.6887205864. The cubic root of 129474557 is about 505.8962706648.

It can be divided in two parts, 129474 and 557, that added together give a palindrome (130031).

The spelling of 129474557 in words is "one hundred twenty-nine million, four hundred seventy-four thousand, five hundred fifty-seven".