129311457 has 8 divisors (see below), whose sum is σ = 188089440. Its totient is φ = 78370560.

The previous prime is 129311419. The next prime is 129311471. The reversal of 129311457 is 754113921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129311457 - 2¹¹ = 129309409 is a prime.

It is a super-2 number, since 2×129311457² = 33442905822925698, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 3918529 = 129311457 / (1 + 2 + 9 + 3 + 1 + 1 + 4 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (129311857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959232 + ... + 1959297.

It is an arithmetic number, because the mean of its divisors is an integer number (23511180).

Almost surely, 2^129311457 is an apocalyptic number.

It is an amenable number.

129311457 is a deficient number, since it is larger than the sum of its proper divisors (58777983).

129311457 is a wasteful number, since it uses less digits than its factorization.

129311457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918543.

The product of its digits is 7560, while the sum is 33.

The square root of 129311457 is about 11371.5195554508. The cubic root of 129311457 is about 505.6837543867.

The spelling of 129311457 in words is "one hundred twenty-nine million, three hundred eleven thousand, four hundred fifty-seven".