1097831 has 4 divisors (see below), whose sum is σ = 1254672. Its totient is φ = 940992.

The previous prime is 1097819. The next prime is 1097849. The reversal of 1097831 is 1387901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1387901 = 31 ⋅44771.

It is a cyclic number.

It is not a de Polignac number, because 1097831 - 2¹⁰ = 1096807 is a prime.

It is a super-2 number, since 2×1097831² = 2410465809122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1097794 and 1097803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78410 + ... + 78423.

It is an arithmetic number, because the mean of its divisors is an integer number (313668).

2^1097831 is an apocalyptic number.

1097831 is a deficient number, since it is larger than the sum of its proper divisors (156841).

1097831 is an equidigital number, since it uses as much as digits as its factorization.

1097831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156840.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1097831 is about 1047.7743077591. The cubic root of 1097831 is about 103.1601179448.

The spelling of 1097831 in words is "one million, ninety-seven thousand, eight hundred thirty-one".