213561487 has 2 divisors, whose sum is σ = 213561488. Its totient is φ = 213561486.

The previous prime is 213561461. The next prime is 213561529. The reversal of 213561487 is 784165312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213561487 - 2¹⁹ = 213037199 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213561287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106780743 + 106780744.

It is an arithmetic number, because the mean of its divisors is an integer number (106780744).

Almost surely, 2^213561487 is an apocalyptic number.

213561487 is a deficient number, since it is larger than the sum of its proper divisors (1).

213561487 is an equidigital number, since it uses as much as digits as its factorization.

213561487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 213561487 is about 14613.7430865607. The cubic root of 213561487 is about 597.7335671760.

The spelling of 213561487 in words is "two hundred thirteen million, five hundred sixty-one thousand, four hundred eighty-seven".