1191255901 has 8 divisors (see below), whose sum is σ = 1367949600. Its totient is φ = 1025961840.

The previous prime is 1191255899. The next prime is 1191255907. The reversal of 1191255901 is 1095521911.

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 1191255901 - 2¹ = 1191255899 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 (1191255907) 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, 2849686 + ... + 2850103.

It is an arithmetic number, because the mean of its divisors is an integer number (170993700).

Almost surely, 2^1191255901 is an apocalyptic number.

1191255901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1191255901 is a deficient number, since it is larger than the sum of its proper divisors (176693699).

1191255901 is a wasteful number, since it uses less digits than its factorization.

1191255901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5699819.

The product of its (nonzero) digits is 4050, while the sum is 34.

The square root of 1191255901 is about 34514.5751965746. The cubic root of 1191255901 is about 1060.0711655673.

The spelling of 1191255901 in words is "one billion, one hundred ninety-one million, two hundred fifty-five thousand, nine hundred one".