1140520781 has 4 divisors (see below), whose sum is σ = 1140650652. Its totient is φ = 1140390912.

The previous prime is 1140520687. The next prime is 1140520793. The reversal of 1140520781 is 1870250411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1042708681 + 97812100 = 32291^2 + 9890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1140520781 - 2²⁶ = 1073411917 is a prime.

It is a super-2 number, since 2×1140520781² = 2601575303785699922, 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 (1140520081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50726 + ... + 69671.

It is an arithmetic number, because the mean of its divisors is an integer number (285162663).

Almost surely, 2^1140520781 is an apocalyptic number.

It is an amenable number.

1140520781 is a deficient number, since it is larger than the sum of its proper divisors (129871).

1140520781 is an equidigital number, since it uses as much as digits as its factorization.

1140520781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129870.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1140520781 is about 33771.5972527211. The cubic root of 1140520781 is about 1044.8029759122.

The spelling of 1140520781 in words is "one billion, one hundred forty million, five hundred twenty thousand, seven hundred eighty-one".