870981 has 4 divisors (see below), whose sum is σ = 1161312. Its totient is φ = 580652.

The previous prime is 870977. The next prime is 870983. The reversal of 870981 is 189078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 870981 - 2² = 870977 is a prime.

It is a super-2 number, since 2×870981² = 1517215804722, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

870981 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 870981.

It is not an unprimeable number, because it can be changed into a prime (870983) 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, 145161 + ... + 145166.

It is an arithmetic number, because the mean of its divisors is an integer number (290328).

2⁸⁷⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

870981 is a deficient number, since it is larger than the sum of its proper divisors (290331).

870981 is a wasteful number, since it uses less digits than its factorization.

870981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290330.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 870981 is about 933.2636283495. The cubic root of 870981 is about 95.4998949224.

The spelling of 870981 in words is "eight hundred seventy thousand, nine hundred eighty-one".