1315551 has 4 divisors (see below), whose sum is σ = 1754072. Its totient is φ = 877032.

The previous prime is 1315549. The next prime is 1315553. The reversal of 1315551 is 1555131.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1315549) and next prime (1315553).

It is not a de Polignac number, because 1315551 - 2¹ = 1315549 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315553) 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 3 ways as a sum of consecutive naturals, for example, 219256 + ... + 219261.

It is an arithmetic number, because the mean of its divisors is an integer number (438518).

2^1315551 is an apocalyptic number.

1315551 is a deficient number, since it is larger than the sum of its proper divisors (438521).

1315551 is an equidigital number, since it uses as much as digits as its factorization.

1315551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438520.

The product of its digits is 375, while the sum is 21.

The square root of 1315551 is about 1146.9747163735. The cubic root of 1315551 is about 109.5727503872.

The spelling of 1315551 in words is "one million, three hundred fifteen thousand, five hundred fifty-one".