129417925531 has 4 divisors (see below), whose sum is σ = 131056127200. Its totient is φ = 127779723864.

The previous prime is 129417925519. The next prime is 129417925699. The reversal of 129417925531 is 135529714921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135529714921 = 11117 ⋅12191213.

It is a cyclic number.

It is not a de Polignac number, because 129417925531 - 2¹⁵ = 129417892763 is a prime.

It is a super-2 number, since 2×129417925531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129417925331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819100716 + ... + 819100873.

It is an arithmetic number, because the mean of its divisors is an integer number (32764031800).

Almost surely, 2^129417925531 is an apocalyptic number.

129417925531 is a deficient number, since it is larger than the sum of its proper divisors (1638201669).

129417925531 is an equidigital number, since it uses as much as digits as its factorization.

129417925531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638201668.

The product of its digits is 680400, while the sum is 49.

The spelling of 129417925531 in words is "one hundred twenty-nine billion, four hundred seventeen million, nine hundred twenty-five thousand, five hundred thirty-one".