1155121967 has 16 divisors (see below), whose sum is σ = 1293984000. Its totient is φ = 1024721280.

The previous prime is 1155121921. The next prime is 1155121993. The reversal of 1155121967 is 7691215511.

It is a cyclic number.

It is not a de Polignac number, because 1155121967 - 2⁸ = 1155121711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155121967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155121067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55292 + ... + 73262.

It is an arithmetic number, because the mean of its divisors is an integer number (80874000).

Almost surely, 2^1155121967 is an apocalyptic number.

1155121967 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1155121967 is a deficient number, since it is larger than the sum of its proper divisors (138862033).

1155121967 is a wasteful number, since it uses less digits than its factorization.

1155121967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18206.

The product of its digits is 18900, while the sum is 38.

The square root of 1155121967 is about 33987.0852972125. The cubic root of 1155121967 is about 1049.2426790019.

The spelling of 1155121967 in words is "one billion, one hundred fifty-five million, one hundred twenty-one thousand, nine hundred sixty-seven".