1097971823 has 4 divisors (see below), whose sum is σ = 1182431208. Its totient is φ = 1013512440.

The previous prime is 1097971793. The next prime is 1097971837. The reversal of 1097971823 is 3281797901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3281797901 = 42649 ⋅76949.

It is a cyclic number.

It is not a de Polignac number, because 1097971823 - 2¹² = 1097967727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097971123) 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, 42229673 + ... + 42229698.

It is an arithmetic number, because the mean of its divisors is an integer number (295607802).

Almost surely, 2^1097971823 is an apocalyptic number.

1097971823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1097971823 is a deficient number, since it is larger than the sum of its proper divisors (84459385).

1097971823 is an equidigital number, since it uses as much as digits as its factorization.

1097971823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84459384.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1097971823 is about 33135.6578778813. The cubic root of 1097971823 is about 1031.6452867107.

The spelling of 1097971823 in words is "one billion, ninety-seven million, nine hundred seventy-one thousand, eight hundred twenty-three".