213770087 has 4 divisors (see below), whose sum is σ = 226344816. Its totient is φ = 201195360.

The previous prime is 213770077. The next prime is 213770113. The reversal of 213770087 is 780077312.

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

It is a cyclic number.

It is not a de Polignac number, because 213770087 - 2²⁴ = 196992871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213770077) 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, 6287339 + ... + 6287372.

It is an arithmetic number, because the mean of its divisors is an integer number (56586204).

Almost surely, 2^213770087 is an apocalyptic number.

213770087 is a deficient number, since it is larger than the sum of its proper divisors (12574729).

213770087 is a wasteful number, since it uses less digits than its factorization.

213770087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12574728.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 213770087 is about 14620.8784619803. The cubic root of 213770087 is about 597.9281194945.

The spelling of 213770087 in words is "two hundred thirteen million, seven hundred seventy thousand, eighty-seven".