22781651 has 2 divisors, whose sum is σ = 22781652. Its totient is φ = 22781650.

The previous prime is 22781599. The next prime is 22781659. The reversal of 22781651 is 15618722.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22781651 - 2¹⁰ = 22780627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22781659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11390825 + 11390826.

It is an arithmetic number, because the mean of its divisors is an integer number (11390826).

Almost surely, 2^22781651 is an apocalyptic number.

22781651 is a deficient number, since it is larger than the sum of its proper divisors (1).

22781651 is an equidigital number, since it uses as much as digits as its factorization.

22781651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 22781651 is about 4773.0127802050. The cubic root of 22781651 is about 283.4838995198.

It can be divided in two parts, 22781 and 651, that added together give a palindrome (23432).

The spelling of 22781651 in words is "twenty-two million, seven hundred eighty-one thousand, six hundred fifty-one".