1155961994 has 8 divisors (see below), whose sum is σ = 1891574208. Its totient is φ = 525437260.

The previous prime is 1155961973. The next prime is 1155961997. The reversal of 1155961994 is 4991695511.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1155961997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26271842 + ... + 26271885.

It is an arithmetic number, because the mean of its divisors is an integer number (236446776).

Almost surely, 2^1155961994 is an apocalyptic number.

1155961994 is a deficient number, since it is larger than the sum of its proper divisors (735612214).

1155961994 is a wasteful number, since it uses less digits than its factorization.

1155961994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52543740.

The product of its digits is 437400, while the sum is 50.

The square root of 1155961994 is about 33999.4410836414. The cubic root of 1155961994 is about 1049.4969605515.

The spelling of 1155961994 in words is "one billion, one hundred fifty-five million, nine hundred sixty-one thousand, nine hundred ninety-four".