1298728081 has 8 divisors (see below), whose sum is σ = 1485598400. Its totient is φ = 1112192208.

The previous prime is 1298728069. The next prime is 1298728103. The reversal of 1298728081 is 1808278921.

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 1298728081 - 2¹³ = 1298719889 is a prime.

It is a super-2 number, since 2×1298728081² = 3373389256755885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1298728061) 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, 75231 + ... + 90868.

It is an arithmetic number, because the mean of its divisors is an integer number (185699800).

Almost surely, 2^1298728081 is an apocalyptic number.

It is an amenable number.

1298728081 is a deficient number, since it is larger than the sum of its proper divisors (186870319).

1298728081 is a wasteful number, since it uses less digits than its factorization.

1298728081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167223.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1298728081 is about 36037.8700952207. The cubic root of 1298728081 is about 1091.0368275953.

The spelling of 1298728081 in words is "one billion, two hundred ninety-eight million, seven hundred twenty-eight thousand, eighty-one".