1151221515 has 16 divisors (see below), whose sum is σ = 1891737888. Its totient is φ = 597390336.

The previous prime is 1151221501. The next prime is 1151221543. The reversal of 1151221515 is 5151221511.

It is not a de Polignac number, because 1151221515 - 2⁶ = 1151221451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1036582 + ... + 1037691.

It is an arithmetic number, because the mean of its divisors is an integer number (118233618).

Almost surely, 2^1151221515 is an apocalyptic number.

1151221515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1151221515 is a deficient number, since it is larger than the sum of its proper divisors (740516373).

1151221515 is a wasteful number, since it uses less digits than its factorization.

1151221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074318.

The product of its digits is 500, while the sum is 24.

The square root of 1151221515 is about 33929.6553917071. The cubic root of 1151221515 is about 1048.0603693032.

The spelling of 1151221515 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, five hundred fifteen".