1299880455129 has 9 divisors (see below), whose sum is σ = 1877610042399. Its totient is φ = 866584689840.

The previous prime is 1299880455089. The next prime is 1299880455191. The reversal of 1299880455129 is 9215540889921.

The square root of 1299880455129 is 1140123.

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

1299880455129 is a `hidden beast` number, since 1 + 2 + 9 + 98 + 80 + 455 + 12 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 147435264729 + 1152445190400 = 383973^2 + 1073520^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1299880455129 - 2¹⁹ = 1299879930841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1299880455329) 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, 3230349 + ... + 3610389.

Almost surely, 2^{1299880455129} is an apocalyptic number.

1299880455129 is the 1140123-rd square number.

1299880455129 is the 570062-nd centered octagonal number.

It is an amenable number.

1299880455129 is a deficient number, since it is larger than the sum of its proper divisors (577729587270).

1299880455129 is an frugal number, since it uses more digits than its factorization.

1299880455129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760088 (or 380044 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 63.

The spelling of 1299880455129 in words is "one trillion, two hundred ninety-nine billion, eight hundred eighty million, four hundred fifty-five thousand, one hundred twenty-nine".