1081018731 has 16 divisors (see below), whose sum is σ = 1568239904. Its totient is φ = 658381824.

The previous prime is 1081018721. The next prime is 1081018739. The reversal of 1081018731 is 1378101801.

It is a happy number.

It is not a de Polignac number, because 1081018731 - 2¹⁵ = 1080985963 is a prime.

It is a super-3 number, since 3×1081018731³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081018739) 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, 139096 + ... + 146661.

It is an arithmetic number, because the mean of its divisors is an integer number (98014994).

Almost surely, 2^1081018731 is an apocalyptic number.

1081018731 is a deficient number, since it is larger than the sum of its proper divisors (487221173).

1081018731 is a wasteful number, since it uses less digits than its factorization.

1081018731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285870.

The product of its (nonzero) digits is 1344, while the sum is 30.

The square root of 1081018731 is about 32878.8492955578. The cubic root of 1081018731 is about 1026.3080602405.

The spelling of 1081018731 in words is "one billion, eighty-one million, eighteen thousand, seven hundred thirty-one".