5581651 has 2 divisors, whose sum is σ = 5581652. Its totient is φ = 5581650.

The previous prime is 5581637. The next prime is 5581679. The reversal of 5581651 is 1561855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5581651 - 2⁵ = 5581619 is a prime.

It is not a weakly prime, because it can be changed into another prime (5581691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2790825 + 2790826.

It is an arithmetic number, because the mean of its divisors is an integer number (2790826).

Almost surely, 2^5581651 is an apocalyptic number.

5581651 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581651 is an equidigital number, since it uses as much as digits as its factorization.

5581651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 31.

The square root of 5581651 is about 2362.5517983740. The cubic root of 5581651 is about 177.3866339519.

It can be divided in two parts, 558 and 1651, that added together give a square (2209 = 47²).

The spelling of 5581651 in words is "five million, five hundred eighty-one thousand, six hundred fifty-one".