1091051639 has 2 divisors, whose sum is σ = 1091051640. Its totient is φ = 1091051638.

The previous prime is 1091051593. The next prime is 1091051641. The reversal of 1091051639 is 9361501901.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091051639 is a prime.

Together with 1091051641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1091051599 and 1091051608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091051669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545525819 + 545525820.

It is an arithmetic number, because the mean of its divisors is an integer number (545525820).

Almost surely, 2^1091051639 is an apocalyptic number.

1091051639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091051639 is an equidigital number, since it uses as much as digits as its factorization.

1091051639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 1091051639 is about 33031.0708121914. The cubic root of 1091051639 is about 1029.4733346067.

The spelling of 1091051639 in words is "one billion, ninety-one million, fifty-one thousand, six hundred thirty-nine".