129131289449 has 8 divisors (see below), whose sum is σ = 132248008992. Its totient is φ = 126019736640.

The previous prime is 129131289431. The next prime is 129131289473. The reversal of 129131289449 is 944982131921.

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

It is a cyclic number.

It is not a de Polignac number, because 129131289449 - 2⁸ = 129131289193 is a prime.

It is a super-2 number, since 2×129131289449² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129131289449.

It is not an unprimeable number, because it can be changed into a prime (129131289499) 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, 1241072 + ... + 1341089.

It is an arithmetic number, because the mean of its divisors is an integer number (16531001124).

Almost surely, 2^129131289449 is an apocalyptic number.

It is an amenable number.

129131289449 is a deficient number, since it is larger than the sum of its proper divisors (3116719543).

129131289449 is a wasteful number, since it uses less digits than its factorization.

129131289449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583367.

The product of its digits is 1119744, while the sum is 53.

The spelling of 129131289449 in words is "one hundred twenty-nine billion, one hundred thirty-one million, two hundred eighty-nine thousand, four hundred forty-nine".