1087531 has 4 divisors (see below), whose sum is σ = 1090600. Its totient is φ = 1084464.

The previous prime is 1087519. The next prime is 1087543. The reversal of 1087531 is 1357801.

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 (1087519) and next prime (1087543).

It is a cyclic number.

It is not a de Polignac number, because 1087531 - 2⁹ = 1087019 is a prime.

It is a super-2 number, since 2×1087531² = 2365447351922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

1087531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1087496 and 1087505.

It is not an unprimeable number, because it can be changed into a prime (1087561) 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, 921 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (272650).

2^1087531 is an apocalyptic number.

1087531 is a deficient number, since it is larger than the sum of its proper divisors (3069).

1087531 is an equidigital number, since it uses as much as digits as its factorization.

1087531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1087531 is about 1042.8475439871. The cubic root of 1087531 is about 102.8364829353.

The spelling of 1087531 in words is "one million, eighty-seven thousand, five hundred thirty-one".