1209801693 has 4 divisors (see below), whose sum is σ = 1613068928. Its totient is φ = 806534460.

The previous prime is 1209801631. The next prime is 1209801707. The reversal of 1209801693 is 3961089021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3961089021 = 3 ⋅1320363007.

It is not a de Polignac number, because 1209801693 - 2¹² = 1209797597 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 (1209801293) 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, 201633613 + ... + 201633618.

It is an arithmetic number, because the mean of its divisors is an integer number (403267232).

Almost surely, 2^1209801693 is an apocalyptic number.

It is an amenable number.

1209801693 is a deficient number, since it is larger than the sum of its proper divisors (403267235).

1209801693 is an equidigital number, since it uses as much as digits as its factorization.

1209801693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403267234.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1209801693 is about 34782.2036823431. The cubic root of 1209801693 is about 1065.5440197065.

The spelling of 1209801693 in words is "one billion, two hundred nine million, eight hundred one thousand, six hundred ninety-three".