1278882789129 has 45 divisors (see below), whose sum is σ = 2100077808829. Its totient is φ = 775012625640.

The previous prime is 1278882789031. The next prime is 1278882789157. The reversal of 1278882789129 is 9219872888721.

The square root of 1278882789129 is 1130877.

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

1278882789129 is a `hidden beast` number, since 1 + 278 + 88 + 278 + 9 + 1 + 2 + 9 = 666.

It is not a de Polignac number, because 1278882789129 - 2¹⁷ = 1278882658057 is a prime.

It is a super-3 number, since 3×1278882789129³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1278882789169) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 111951112 + ... + 111962534.

Almost surely, 2^{1278882789129} is an apocalyptic number.

1278882789129 is the 1130877-th square number.

1278882789129 is the 565439-th centered octagonal number.

It is an amenable number.

1278882789129 is a deficient number, since it is larger than the sum of its proper divisors (821195019700).

1278882789129 is an frugal number, since it uses more digits than its factorization.

1278882789129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22880 (or 11437 counting only the distinct ones).

The product of its digits is 130056192, while the sum is 72.

The spelling of 1278882789129 in words is "one trillion, two hundred seventy-eight billion, eight hundred eighty-two million, seven hundred eighty-nine thousand, one hundred twenty-nine".