129431445 has 64 divisors (see below), whose sum is σ = 246564864. Its totient is φ = 57150720.

The previous prime is 129431441. The next prime is 129431453. The reversal of 129431445 is 544134921.

It is not a de Polignac number, because 129431445 - 2² = 129431441 is a prime.

It is a super-3 number, since 3×129431445³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129431441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 177672 + ... + 178398.

It is an arithmetic number, because the mean of its divisors is an integer number (3852576).

Almost surely, 2^129431445 is an apocalyptic number.

129431445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129431445 is a deficient number, since it is larger than the sum of its proper divisors (117133419).

129431445 is a wasteful number, since it uses less digits than its factorization.

129431445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its digits is 17280, while the sum is 33.

The square root of 129431445 is about 11376.7941442218. The cubic root of 129431445 is about 505.8401138884.

The spelling of 129431445 in words is "one hundred twenty-nine million, four hundred thirty-one thousand, four hundred forty-five".