4421969781 has 4 divisors (see below), whose sum is σ = 5895959712. Its totient is φ = 2947979852.

The previous prime is 4421969767. The next prime is 4421969791. The reversal of 4421969781 is 1879691244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4421969781 - 2⁷ = 4421969653 is a prime.

It is a super-2 number, since 2×4421969781² = 39107633488154375922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421969791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736994961 + ... + 736994966.

It is an arithmetic number, because the mean of its divisors is an integer number (1473989928).

Almost surely, 2^4421969781 is an apocalyptic number.

It is an amenable number.

4421969781 is a deficient number, since it is larger than the sum of its proper divisors (1473989931).

4421969781 is a wasteful number, since it uses less digits than its factorization.

4421969781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473989930.

The product of its digits is 870912, while the sum is 51.

The square root of 4421969781 is about 66497.8930568480. The cubic root of 4421969781 is about 1641.3653339903.

The spelling of 4421969781 in words is "four billion, four hundred twenty-one million, nine hundred sixty-nine thousand, seven hundred eighty-one".