2947512681 has 9 divisors (see below), whose sum is σ = 4257753591. Its totient is φ = 1964899872.

The previous prime is 2947512613. The next prime is 2947512749. The reversal of 2947512681 is 1862157492.

The square root of 2947512681 is 54291.

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

It is an interprime number because it is at equal distance from previous prime (2947512613) and next prime (2947512749).

It can be written as a sum of positive squares in only one way, i.e., 385533225 + 2561979456 = 19635^2 + 50616^2 .

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

It is not a de Polignac number, because 2947512681 - 2⁷ = 2947512553 is a prime.

It is a super-2 number, since 2×2947512681² = 17375662009311615522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2947512481) 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, 153825 + ... + 171921.

Almost surely, 2^2947512681 is an apocalyptic number.

2947512681 is the 54291-st square number.

2947512681 is the 27146-th centered octagonal number.

It is an amenable number.

2947512681 is a deficient number, since it is larger than the sum of its proper divisors (1310240910).

2947512681 is an frugal number, since it uses more digits than its factorization.

2947512681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36200 (or 18100 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The cubic root of 2947512681 is about 1433.7889446801.

The spelling of 2947512681 in words is "two billion, nine hundred forty-seven million, five hundred twelve thousand, six hundred eighty-one".