440781641 has 2 divisors, whose sum is σ = 440781642. Its totient is φ = 440781640.

The previous prime is 440781631. The next prime is 440781673. The reversal of 440781641 is 146187044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397603600 + 43178041 = 19940^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 440781641 - 2¹⁴ = 440765257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (440781631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220390820 + 220390821.

It is an arithmetic number, because the mean of its divisors is an integer number (220390821).

Almost surely, 2^440781641 is an apocalyptic number.

It is an amenable number.

440781641 is a deficient number, since it is larger than the sum of its proper divisors (1).

440781641 is an equidigital number, since it uses as much as digits as its factorization.

440781641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 440781641 is about 20994.8003324633. The cubic root of 440781641 is about 761.0406111070.

The spelling of 440781641 in words is "four hundred forty million, seven hundred eighty-one thousand, six hundred forty-one".