2947581 has 48 divisors (see below), whose sum is σ = 5416320. Its totient is φ = 1503360.

The previous prime is 2947561. The next prime is 2947583. The reversal of 2947581 is 1857492.

It is not a de Polignac number, because 2947581 - 2⁶ = 2947517 is a prime.

It is a super-2 number, since 2×2947581² = 17376467503122, which contains 22 as substring.

2947581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2947583) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48291 + ... + 48351.

It is an arithmetic number, because the mean of its divisors is an integer number (112840).

2^2947581 is an apocalyptic number.

2947581 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2947581 is a deficient number, since it is larger than the sum of its proper divisors (2468739).

2947581 is a wasteful number, since it uses less digits than its factorization.

2947581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 143 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2947581 is about 1716.8520611864. The cubic root of 2947581 is about 143.3800022299.

It can be divided in two parts, 294 and 7581, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 2947581 in words is "two million, nine hundred forty-seven thousand, five hundred eighty-one".