1091939473 has 2 divisors, whose sum is σ = 1091939474. Its totient is φ = 1091939472.

The previous prime is 1091939447. The next prime is 1091939477. The reversal of 1091939473 is 3749391901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091179089 + 760384 = 33033^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091939473 - 2²¹ = 1089842321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091939477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545969736 + 545969737.

It is an arithmetic number, because the mean of its divisors is an integer number (545969737).

Almost surely, 2^1091939473 is an apocalyptic number.

It is an amenable number.

1091939473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091939473 is an equidigital number, since it uses as much as digits as its factorization.

1091939473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 1091939473 is about 33044.5074558541. The cubic root of 1091939473 is about 1029.7525006235.

The spelling of 1091939473 in words is "one billion, ninety-one million, nine hundred thirty-nine thousand, four hundred seventy-three".