1151287121 has 6 divisors (see below), whose sum is σ = 1215070722. Its totient is φ = 1090692720.

The previous prime is 1151287097. The next prime is 1151287157. The reversal of 1151287121 is 1217821511.

It can be written as a sum of positive squares in only one way, i.e., 1113156496 + 38130625 = 33364^2 + 6175^2 .

It is not a de Polignac number, because 1151287121 - 2²⁶ = 1084178257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151287721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1594220 + ... + 1594941.

It is an arithmetic number, because the mean of its divisors is an integer number (202511787).

Almost surely, 2^1151287121 is an apocalyptic number.

It is an amenable number.

1151287121 is a deficient number, since it is larger than the sum of its proper divisors (63783601).

1151287121 is an equidigital number, since it uses as much as digits as its factorization.

1151287121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189199 (or 3189180 counting only the distinct ones).

The product of its digits is 1120, while the sum is 29.

The square root of 1151287121 is about 33930.6221723092. The cubic root of 1151287121 is about 1048.0802779370.

The spelling of 1151287121 in words is "one billion, one hundred fifty-one million, two hundred eighty-seven thousand, one hundred twenty-one".