1517991422 has 4 divisors (see below), whose sum is σ = 2276987136. Its totient is φ = 758995710.

The previous prime is 1517991413. The next prime is 1517991473. The reversal of 1517991422 is 2241997151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2241997151 = 23 ⋅97478137.

It is a self number, because there is not a number n which added to its sum of digits gives 1517991422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 379497854 + ... + 379497857.

It is an arithmetic number, because the mean of its divisors is an integer number (569246784).

Almost surely, 2^1517991422 is an apocalyptic number.

1517991422 is a deficient number, since it is larger than the sum of its proper divisors (758995714).

1517991422 is an equidigital number, since it uses as much as digits as its factorization.

1517991422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758995713.

The product of its digits is 45360, while the sum is 41.

The square root of 1517991422 is about 38961.4093944251. The cubic root of 1517991422 is about 1149.2727404303.

It can be divided in two parts, 15179 and 91422, that added together give a palindrome (106601).

The spelling of 1517991422 in words is "one billion, five hundred seventeen million, nine hundred ninety-one thousand, four hundred twenty-two".