129702980449 has 9 divisors (see below), whose sum is σ = 150881909907. Its totient is φ = 111171822384.

The previous prime is 129702980423. The next prime is 129702980507. The reversal of 129702980449 is 944089207921.

It is a happy number.

The square root of 129702980449 is 360143.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 39942820449 + 89760160000 = 199857^2 + 299600^2 .

It is not a de Polignac number, because 129702980449 - 2⁵ = 129702980417 is a prime.

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 129702980449.

It is not an unprimeable number, because it can be changed into a prime (129702930449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2495277 + ... + 2546725.

Almost surely, 2^129702980449 is an apocalyptic number.

129702980449 is the 360143-rd square number.

129702980449 is the 180072-nd centered octagonal number.

It is an amenable number.

129702980449 is a deficient number, since it is larger than the sum of its proper divisors (21178929458).

129702980449 is an frugal number, since it uses more digits than its factorization.

129702980449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102912 (or 51456 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 129702980449 in words is "one hundred twenty-nine billion, seven hundred two million, nine hundred eighty thousand, four hundred forty-nine".