129842031 has 32 divisors (see below), whose sum is σ = 193314816. Its totient is φ = 76860000.

The previous prime is 129842023. The next prime is 129842087. The reversal of 129842031 is 130248921.

It is not a de Polignac number, because 129842031 - 2³ = 129842023 is a prime.

It is a super-2 number, since 2×129842031² = 33717906028409922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129842031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129842021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353610 + ... + 353976.

It is an arithmetic number, because the mean of its divisors is an integer number (6041088).

Almost surely, 2^129842031 is an apocalyptic number.

129842031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129842031 is a deficient number, since it is larger than the sum of its proper divisors (63472785).

129842031 is a wasteful number, since it uses less digits than its factorization.

129842031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 129842031 is about 11394.8247463487. The cubic root of 129842031 is about 506.3744292834.

The spelling of 129842031 in words is "one hundred twenty-nine million, eight hundred forty-two thousand, thirty-one".