2513818981 has 8 divisors (see below), whose sum is σ = 2523317120. Its totient is φ = 2504335968.

The previous prime is 2513818949. The next prime is 2513818999. The reversal of 2513818981 is 1898183152.

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 2513818981 - 2⁵ = 2513818949 is a prime.

It is a super-2 number, since 2×2513818981² = 12638571738471756722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2513818381) 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, 411310 + ... + 417376.

It is an arithmetic number, because the mean of its divisors is an integer number (315414640).

Almost surely, 2^2513818981 is an apocalyptic number.

It is an amenable number.

2513818981 is a deficient number, since it is larger than the sum of its proper divisors (9498139).

2513818981 is a wasteful number, since it uses less digits than its factorization.

2513818981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563.

The product of its digits is 138240, while the sum is 46.

The square root of 2513818981 is about 50137.9993717340. Note that the first 3 decimals coincide. The cubic root of 2513818981 is about 1359.7049138113.

The spelling of 2513818981 in words is "two billion, five hundred thirteen million, eight hundred eighteen thousand, nine hundred eighty-one".