129190331 has 4 divisors (see below), whose sum is σ = 133645200. Its totient is φ = 124735464.

The previous prime is 129190289. The next prime is 129190339. The reversal of 129190331 is 133091921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129190331 - 2⁶ = 129190267 is a prime.

It is a super-2 number, since 2×129190331² = 33380283247779122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 4454839 = 129190331 / (1 + 2 + 9 + 1 + 9 + 0 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129190294 and 129190303.

It is not an unprimeable number, because it can be changed into a prime (129190339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2227391 + ... + 2227448.

It is an arithmetic number, because the mean of its divisors is an integer number (33411300).

Almost surely, 2^129190331 is an apocalyptic number.

129190331 is a deficient number, since it is larger than the sum of its proper divisors (4454869).

129190331 is an equidigital number, since it uses as much as digits as its factorization.

129190331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454868.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 129190331 is about 11366.1924583389. The cubic root of 129190331 is about 505.5258137924.

The spelling of 129190331 in words is "one hundred twenty-nine million, one hundred ninety thousand, three hundred thirty-one".