870551 has 8 divisors (see below), whose sum is σ = 982800. Its totient is φ = 763840.

The previous prime is 870547. The next prime is 870577. The reversal of 870551 is 155078.

870551 = T₂₁₃ + T₂₁₄ + ... + T₂₄₅.

870551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 870551 - 2² = 870547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 870551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2⁸⁷⁰⁵⁵¹ is an apocalyptic number.

870551 is a deficient number, since it is larger than the sum of its proper divisors (112249).

870551 is a wasteful number, since it uses less digits than its factorization.

870551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 870551 is about 933.0332255606. The cubic root of 870551 is about 95.4841763573.

The spelling of 870551 in words is "eight hundred seventy thousand, five hundred fifty-one".