1081381731 has 8 divisors (see below), whose sum is σ = 1504531200. Its totient is φ = 689576712.

The previous prime is 1081381729. The next prime is 1081381753. The reversal of 1081381731 is 1371831801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1081381731 - 2¹ = 1081381729 is a prime.

It is a super-4 number, since 4×1081381731⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1081381692 and 1081381701.

It is not an unprimeable number, because it can be changed into a prime (1081381031) 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 7 ways as a sum of consecutive naturals, for example, 7836031 + ... + 7836168.

It is an arithmetic number, because the mean of its divisors is an integer number (188066400).

Almost surely, 2^1081381731 is an apocalyptic number.

1081381731 is a deficient number, since it is larger than the sum of its proper divisors (423149469).

1081381731 is a wasteful number, since it uses less digits than its factorization.

1081381731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15672225.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1081381731 is about 32884.3690984030. The cubic root of 1081381731 is about 1026.4229235396.

The spelling of 1081381731 in words is "one billion, eighty-one million, three hundred eighty-one thousand, seven hundred thirty-one".