1031199861 has 8 divisors (see below), whose sum is σ = 1376796640. Its totient is φ = 686534832.

The previous prime is 1031199859. The next prime is 1031199887. The reversal of 1031199861 is 1689911301.

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

It is not a de Polignac number, because 1031199861 - 2¹ = 1031199859 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 (1030199861) 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, 230350 + ... + 234783.

It is an arithmetic number, because the mean of its divisors is an integer number (172099580).

Almost surely, 2^1031199861 is an apocalyptic number.

It is an amenable number.

1031199861 is a deficient number, since it is larger than the sum of its proper divisors (345596779).

1031199861 is an equidigital number, since it uses as much as digits as its factorization.

1031199861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465875.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 1031199861 is about 32112.3007740025. The cubic root of 1031199861 is about 1010.2936312552.

The spelling of 1031199861 in words is "one billion, thirty-one million, one hundred ninety-nine thousand, eight hundred sixty-one".