22461781 has 12 divisors (see below), whose sum is σ = 24274272. Its totient is φ = 20770344.

The previous prime is 22461757. The next prime is 22461787. The reversal of 22461781 is 18716422.

It is not a de Polignac number, because 22461781 - 2⁵ = 22461749 is a prime.

It is a super-2 number, since 2×22461781² = 1009063211383922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22461787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14800 + ... + 16246.

It is an arithmetic number, because the mean of its divisors is an integer number (2022856).

Almost surely, 2^22461781 is an apocalyptic number.

It is an amenable number.

22461781 is a deficient number, since it is larger than the sum of its proper divisors (1812491).

22461781 is a wasteful number, since it uses less digits than its factorization.

22461781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1509 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 22461781 is about 4739.3861416854. The cubic root of 22461781 is about 282.1508716015.

The spelling of 22461781 in words is "twenty-two million, four hundred sixty-one thousand, seven hundred eighty-one".