1145251720 has 16 divisors (see below), whose sum is σ = 2576816460. Its totient is φ = 458100672.

The previous prime is 1145251687. The next prime is 1145251721. The reversal of 1145251720 is 271525411.

It can be written as a sum of positive squares in 2 ways, for example, as 1129900996 + 15350724 = 33614^2 + 3918^2 .

It is not an unprimeable number, because it can be changed into a prime (1145251721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14315607 + ... + 14315686.

Almost surely, 2^1145251720 is an apocalyptic number.

1145251720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145251720 is an abundant number, since it is smaller than the sum of its proper divisors (1431564740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1145251720 is a wasteful number, since it uses less digits than its factorization.

1145251720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28631304 (or 28631300 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1145251720 is about 33841.5679305791. The cubic root of 1145251720 is about 1046.2456152363.

The spelling of 1145251720 in words is "one billion, one hundred forty-five million, two hundred fifty-one thousand, seven hundred twenty".