1191720853 has 8 divisors (see below), whose sum is σ = 1199024000. Its totient is φ = 1184431248.

The previous prime is 1191720823. The next prime is 1191720913. The reversal of 1191720853 is 3580271911.

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

It is a cyclic number.

It is not a de Polignac number, because 1191720853 - 2²⁹ = 654849941 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 (1191720823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214768 + ... + 220246.

It is an arithmetic number, because the mean of its divisors is an integer number (149878000).

Almost surely, 2^1191720853 is an apocalyptic number.

It is an amenable number.

1191720853 is a deficient number, since it is larger than the sum of its proper divisors (7303147).

1191720853 is a wasteful number, since it uses less digits than its factorization.

1191720853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1191720853 is about 34521.3101286727. The cubic root of 1191720853 is about 1060.2090643170.

The spelling of 1191720853 in words is "one billion, one hundred ninety-one million, seven hundred twenty thousand, eight hundred fifty-three".