5661287 has 2 divisors, whose sum is σ = 5661288. Its totient is φ = 5661286.

The previous prime is 5661283. The next prime is 5661311. The reversal of 5661287 is 7821665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5661287 - 2² = 5661283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830643 + 2830644.

It is an arithmetic number, because the mean of its divisors is an integer number (2830644).

Almost surely, 2^5661287 is an apocalyptic number.

5661287 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661287 is an equidigital number, since it uses as much as digits as its factorization.

5661287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 5661287 is about 2379.3459185247. The cubic root of 5661287 is about 178.2262724407.

The spelling of 5661287 in words is "five million, six hundred sixty-one thousand, two hundred eighty-seven".