1581045 has 16 divisors (see below), whose sum is σ = 2555520. Its totient is φ = 834624.

The previous prime is 1581037. The next prime is 1581053. The reversal of 1581045 is 5401851.

It is an interprime number because it is at equal distance from previous prime (1581037) and next prime (1581053).

It is not a de Polignac number, because 1581045 - 2³ = 1581037 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1152 + ... + 2118.

It is an arithmetic number, because the mean of its divisors is an integer number (159720).

2^1581045 is an apocalyptic number.

1581045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1581045 is a deficient number, since it is larger than the sum of its proper divisors (974475).

1581045 is a wasteful number, since it uses less digits than its factorization.

1581045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1581045 is about 1257.3961189697. The cubic root of 1581045 is about 116.4970005429.

Adding to 1581045 its reverse (5401851), we get a palindrome (6982896).

The spelling of 1581045 in words is "one million, five hundred eighty-one thousand, forty-five".