1083870721 has 2 divisors, whose sum is σ = 1083870722. Its totient is φ = 1083870720.

The previous prime is 1083870719. The next prime is 1083870727. The reversal of 1083870721 is 1270783801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542657025 + 541213696 = 23295^2 + 23264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1083870721 - 2¹ = 1083870719 is a prime.

Together with 1083870719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1083870727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541935360 + 541935361.

It is an arithmetic number, because the mean of its divisors is an integer number (541935361).

Almost surely, 2^1083870721 is an apocalyptic number.

It is an amenable number.

1083870721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1083870721 is an equidigital number, since it uses as much as digits as its factorization.

1083870721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 1083870721 is about 32922.1919227745. The cubic root of 1083870721 is about 1027.2098176734.

The spelling of 1083870721 in words is "one billion, eighty-three million, eight hundred seventy thousand, seven hundred twenty-one".