1219097823 has 4 divisors (see below), whose sum is σ = 1625463768. Its totient is φ = 812731880.

The previous prime is 1219097821. The next prime is 1219097827. The reversal of 1219097823 is 3287909121.

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 1219097823 - 2¹ = 1219097821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219097821) 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, 203182968 + ... + 203182973.

It is an arithmetic number, because the mean of its divisors is an integer number (406365942).

Almost surely, 2^1219097823 is an apocalyptic number.

1219097823 is a deficient number, since it is larger than the sum of its proper divisors (406365945).

1219097823 is an equidigital number, since it uses as much as digits as its factorization.

1219097823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406365944.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1219097823 is about 34915.5813785192. The cubic root of 1219097823 is about 1068.2662764146.

The spelling of 1219097823 in words is "one billion, two hundred nineteen million, ninety-seven thousand, eight hundred twenty-three".