1111721990 has 8 divisors (see below), whose sum is σ = 2001099600. Its totient is φ = 444688792.

The previous prime is 1111721981. The next prime is 1111721993. The reversal of 1111721990 is 991271111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111721993) 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, 55586090 + ... + 55586109.

It is an arithmetic number, because the mean of its divisors is an integer number (250137450).

Almost surely, 2^1111721990 is an apocalyptic number.

1111721990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1111721990 is a deficient number, since it is larger than the sum of its proper divisors (889377610).

1111721990 is a wasteful number, since it uses less digits than its factorization.

1111721990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111172206.

The product of its (nonzero) digits is 1134, while the sum is 32.

The square root of 1111721990 is about 33342.4952575538. The cubic root of 1111721990 is about 1035.9339481499.

The spelling of 1111721990 in words is "one billion, one hundred eleven million, seven hundred twenty-one thousand, nine hundred ninety".