1147987155 has 64 divisors (see below), whose sum is σ = 2232023040. Its totient is φ = 492450816.

The previous prime is 1147987151. The next prime is 1147987171. The reversal of 1147987155 is 5517897411.

It is not a de Polignac number, because 1147987155 - 2² = 1147987151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1147987151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 123511 + ... + 132479.

It is an arithmetic number, because the mean of its divisors is an integer number (34875360).

Almost surely, 2^1147987155 is an apocalyptic number.

1147987155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1147987155 is a deficient number, since it is larger than the sum of its proper divisors (1084035885).

1147987155 is a wasteful number, since it uses less digits than its factorization.

1147987155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060.

The product of its digits is 352800, while the sum is 48.

The square root of 1147987155 is about 33881.9591375705. The cubic root of 1147987155 is about 1047.0779391884.

The spelling of 1147987155 in words is "one billion, one hundred forty-seven million, nine hundred eighty-seven thousand, one hundred fifty-five".