4971581 has 4 divisors (see below), whose sum is σ = 5009664. Its totient is φ = 4933500.

The previous prime is 4971553. The next prime is 4971583. The reversal of 4971581 is 1851794.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4971581 - 2¹⁰ = 4970557 is a prime.

It is a super-2 number, since 2×4971581² = 49433235279122, 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 (4971583) 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, 18845 + ... + 19106.

It is an arithmetic number, because the mean of its divisors is an integer number (1252416).

Almost surely, 2^4971581 is an apocalyptic number.

It is an amenable number.

4971581 is a deficient number, since it is larger than the sum of its proper divisors (38083).

4971581 is a wasteful number, since it uses less digits than its factorization.

4971581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38082.

The product of its digits is 10080, while the sum is 35.

The square root of 4971581 is about 2229.7042404767. The cubic root of 4971581 is about 170.6730068818.

The spelling of 4971581 in words is "four million, nine hundred seventy-one thousand, five hundred eighty-one".