1125515511 has 12 divisors (see below), whose sum is σ = 1696429488. Its totient is φ = 717719904.

The previous prime is 1125515509. The next prime is 1125515527. The reversal of 1125515511 is 1155155211.

It is a happy number.

It is not a de Polignac number, because 1125515511 - 2¹ = 1125515509 is a prime.

It is a super-2 number, since 2×1125515511² = 2533570331003182242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125515581) 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 11 ways as a sum of consecutive naturals, for example, 2718430 + ... + 2718843.

It is an arithmetic number, because the mean of its divisors is an integer number (141369124).

Almost surely, 2^1125515511 is an apocalyptic number.

1125515511 is a deficient number, since it is larger than the sum of its proper divisors (570913977).

1125515511 is a wasteful number, since it uses less digits than its factorization.

1125515511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5437302 (or 5437299 counting only the distinct ones).

The product of its digits is 1250, while the sum is 27.

The square root of 1125515511 is about 33548.7035666060. The cubic root of 1125515511 is about 1040.2007474289.

It can be divided in two parts, 1125 and 515511, that added together give a triangular number (516636 = T₁₀₁₆).

The spelling of 1125515511 in words is "one billion, one hundred twenty-five million, five hundred fifteen thousand, five hundred eleven".