2281685621 has 2 divisors, whose sum is σ = 2281685622. Its totient is φ = 2281685620.

The previous prime is 2281685599. The next prime is 2281685633. The reversal of 2281685621 is 1265861822.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2274336100 + 7349521 = 47690^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2281685621 - 2³⁰ = 1207943797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2281685671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1140842810 + 1140842811.

It is an arithmetic number, because the mean of its divisors is an integer number (1140842811).

Almost surely, 2^2281685621 is an apocalyptic number.

It is an amenable number.

2281685621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2281685621 is an equidigital number, since it uses as much as digits as its factorization.

2281685621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The square root of 2281685621 is about 47766.9930077245. The cubic root of 2281685621 is about 1316.4931443031.

The spelling of 2281685621 in words is "two billion, two hundred eighty-one million, six hundred eighty-five thousand, six hundred twenty-one".