1409819681 has 4 divisors (see below), whose sum is σ = 1409897364. Its totient is φ = 1409742000.

The previous prime is 1409819669. The next prime is 1409819683. The reversal of 1409819681 is 1869189041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1869189041 = 8363 ⋅223507.

It can be written as a sum of positive squares in 2 ways, for example, as 827080081 + 582739600 = 28759^2 + 24140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1409819681 is a prime.

It is a super-2 number, since 2×1409819681² = 3975183065869883522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1409819683) 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, 4511 + ... + 53291.

It is an arithmetic number, because the mean of its divisors is an integer number (352474341).

Almost surely, 2^1409819681 is an apocalyptic number.

It is an amenable number.

1409819681 is a deficient number, since it is larger than the sum of its proper divisors (77683).

1409819681 is an equidigital number, since it uses as much as digits as its factorization.

1409819681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77682.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 1409819681 is about 37547.5655802077. The cubic root of 1409819681 is about 1121.2983669931.

The spelling of 1409819681 in words is "one billion, four hundred nine million, eight hundred nineteen thousand, six hundred eighty-one".