1121721626 has 4 divisors (see below), whose sum is σ = 1682582442. Its totient is φ = 560860812.

The previous prime is 1121721589. The next prime is 1121721631. The reversal of 1121721626 is 6261271211.

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

It can be written as a sum of positive squares in only one way, i.e., 743380225 + 378341401 = 27265^2 + 19451^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280430405 + ... + 280430408.

Almost surely, 2^1121721626 is an apocalyptic number.

1121721626 is a deficient number, since it is larger than the sum of its proper divisors (560860816).

1121721626 is an equidigital number, since it uses as much as digits as its factorization.

1121721626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560860815.

The product of its digits is 2016, while the sum is 29.

The square root of 1121721626 is about 33492.1128924408. The cubic root of 1121721626 is about 1039.0306630037.

Adding to 1121721626 its reverse (6261271211), we get a palindrome (7382992837).

The spelling of 1121721626 in words is "one billion, one hundred twenty-one million, seven hundred twenty-one thousand, six hundred twenty-six".