1031111997 has 8 divisors (see below), whose sum is σ = 1379295456. Its totient is φ = 685168272.

The previous prime is 1031111981. The next prime is 1031112031. The reversal of 1031111997 is 7991111301.

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

It is not a de Polignac number, because 1031111997 - 2⁴ = 1031111981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031111197) 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, 558858 + ... + 560699.

It is an arithmetic number, because the mean of its divisors is an integer number (172411932).

Almost surely, 2^1031111997 is an apocalyptic number.

It is an amenable number.

1031111997 is a deficient number, since it is larger than the sum of its proper divisors (348183459).

1031111997 is a wasteful number, since it uses less digits than its factorization.

1031111997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119867.

The product of its (nonzero) digits is 1701, while the sum is 33.

The square root of 1031111997 is about 32110.9326709767. The cubic root of 1031111997 is about 1010.2649362161.

The spelling of 1031111997 in words is "one billion, thirty-one million, one hundred eleven thousand, nine hundred ninety-seven".