1191893955 has 32 divisors (see below), whose sum is σ = 2184259584. Its totient is φ = 543666816.

The previous prime is 1191893951. The next prime is 1191893957. The reversal of 1191893955 is 5593981911.

It is not a de Polignac number, because 1191893955 - 2² = 1191893951 is a prime.

It is a super-2 number, since 2×1191893955² = 2841222399931084050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1191893898 and 1191893907.

It is not an unprimeable number, because it can be changed into a prime (1191893951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36357 + ... + 60873.

It is an arithmetic number, because the mean of its divisors is an integer number (68258112).

Almost surely, 2^1191893955 is an apocalyptic number.

1191893955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1191893955 is a deficient number, since it is larger than the sum of its proper divisors (992365629).

1191893955 is a wasteful number, since it uses less digits than its factorization.

1191893955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24995.

The product of its digits is 437400, while the sum is 51.

The square root of 1191893955 is about 34523.8172136280. The cubic root of 1191893955 is about 1060.2603949688.

The spelling of 1191893955 in words is "one billion, one hundred ninety-one million, eight hundred ninety-three thousand, nine hundred fifty-five".