1081857799 has 8 divisors (see below), whose sum is σ = 1181148048. Its totient is φ = 982724160.

The previous prime is 1081857793. The next prime is 1081857823. The reversal of 1081857799 is 9977581801.

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

It is not a de Polignac number, because 1081857799 - 2¹⁷ = 1081726727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081857793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24462 + ... + 52555.

It is an arithmetic number, because the mean of its divisors is an integer number (147643506).

Almost surely, 2^1081857799 is an apocalyptic number.

1081857799 is a deficient number, since it is larger than the sum of its proper divisors (99290249).

1081857799 is a wasteful number, since it uses less digits than its factorization.

1081857799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78305.

The product of its (nonzero) digits is 1270080, while the sum is 55.

The square root of 1081857799 is about 32891.6068169374. The cubic root of 1081857799 is about 1026.5735257443.

It can be divided in two parts, 1081857 and 799, that added together give a triangular number (1082656 = T₁₄₇₁).

The spelling of 1081857799 in words is "one billion, eighty-one million, eight hundred fifty-seven thousand, seven hundred ninety-nine".