1125292781 has 16 divisors (see below), whose sum is σ = 1214352000. Its totient is φ = 1038855168.

The previous prime is 1125292769. The next prime is 1125292787. The reversal of 1125292781 is 1872925211.

It is a cyclic number.

It is not a de Polignac number, because 1125292781 - 2⁶ = 1125292717 is a prime.

It is a super-2 number, since 2×1125292781² = 2532567685941427922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125292787) 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, 599861 + ... + 601733.

It is an arithmetic number, because the mean of its divisors is an integer number (75897000).

Almost surely, 2^1125292781 is an apocalyptic number.

It is an amenable number.

1125292781 is a deficient number, since it is larger than the sum of its proper divisors (89059219).

1125292781 is a wasteful number, since it uses less digits than its factorization.

1125292781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548.

The product of its digits is 20160, while the sum is 38.

The square root of 1125292781 is about 33545.3839000242. The cubic root of 1125292781 is about 1040.1321272590.

The spelling of 1125292781 in words is "one billion, one hundred twenty-five million, two hundred ninety-two thousand, seven hundred eighty-one".