2529896981 has 4 divisors (see below), whose sum is σ = 2571370764. Its totient is φ = 2488423200.

The previous prime is 2529896969. The next prime is 2529897017. The reversal of 2529896981 is 1896989252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1488802225 + 1041094756 = 38585^2 + 32266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2529896981 is a prime.

It is a super-2 number, since 2×2529896981² = 12800757468945828722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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 2529896981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2529896951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20736800 + ... + 20736921.

It is an arithmetic number, because the mean of its divisors is an integer number (642842691).

Almost surely, 2^2529896981 is an apocalyptic number.

It is an amenable number.

2529896981 is a deficient number, since it is larger than the sum of its proper divisors (41473783).

2529896981 is an equidigital number, since it uses as much as digits as its factorization.

2529896981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41473782.

The product of its digits is 5598720, while the sum is 59.

The square root of 2529896981 is about 50298.0812854725. The cubic root of 2529896981 is about 1362.5975767842.

The spelling of 2529896981 in words is "two billion, five hundred twenty-nine million, eight hundred ninety-six thousand, nine hundred eighty-one".