1091392247 has 4 divisors (see below), whose sum is σ = 1190609736. Its totient is φ = 992174760.

The previous prime is 1091392241. The next prime is 1091392249. The reversal of 1091392247 is 7422931901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1091392247 - 2⁸ = 1091391991 is a prime.

It is a super-2 number, since 2×1091392247² = 2382274073623418018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091392247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091392241) 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, 49608728 + ... + 49608749.

It is an arithmetic number, because the mean of its divisors is an integer number (297652434).

Almost surely, 2^1091392247 is an apocalyptic number.

1091392247 is a deficient number, since it is larger than the sum of its proper divisors (99217489).

1091392247 is an equidigital number, since it uses as much as digits as its factorization.

1091392247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99217488.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1091392247 is about 33036.2262826734. The cubic root of 1091392247 is about 1029.5804515566.

The spelling of 1091392247 in words is "one billion, ninety-one million, three hundred ninety-two thousand, two hundred forty-seven".