1481991 has 8 divisors (see below), whose sum is σ = 2258304. Its totient is φ = 846840.

The previous prime is 1481989. The next prime is 1481993. The reversal of 1481991 is 1991841.

1481991 = T₈₆ + T₈₇ + ... + T₂₁₁.

It is an interprime number because it is at equal distance from previous prime (1481989) and next prime (1481993).

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

It is not a de Polignac number, because 1481991 - 2¹ = 1481989 is a prime.

1481991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1481993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35265 + ... + 35306.

It is an arithmetic number, because the mean of its divisors is an integer number (282288).

2^1481991 is an apocalyptic number.

1481991 is a deficient number, since it is larger than the sum of its proper divisors (776313).

1481991 is an equidigital number, since it uses as much as digits as its factorization.

1481991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70581.

The product of its digits is 2592, while the sum is 33.

The square root of 1481991 is about 1217.3705269966. The cubic root of 1481991 is about 114.0114639133.

The spelling of 1481991 in words is "one million, four hundred eighty-one thousand, nine hundred ninety-one".