1491831 has 16 divisors (see below), whose sum is σ = 2411520. Its totient is φ = 903960.

The previous prime is 1491821. The next prime is 1491839. The reversal of 1491831 is 1381941.

It is not a de Polignac number, because 1491831 - 2¹⁰ = 1490807 is a prime.

It is a super-2 number, since 2×1491831² = 4451119465122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1491795 and 1491804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491839) 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 15 ways as a sum of consecutive naturals, for example, 2215 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (150720).

2^1491831 is an apocalyptic number.

1491831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1491831 is a deficient number, since it is larger than the sum of its proper divisors (919689).

1491831 is a wasteful number, since it uses less digits than its factorization.

1491831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043 (or 5037 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1491831 is about 1221.4053381249. The cubic root of 1491831 is about 114.2632420845.

The spelling of 1491831 in words is "one million, four hundred ninety-one thousand, eight hundred thirty-one".