213540787 has 4 divisors (see below), whose sum is σ = 218084256. Its totient is φ = 208997320.

The previous prime is 213540781. The next prime is 213540793. The reversal of 213540787 is 787045312.

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 (213540781) and next prime (213540793).

It is a cyclic number.

It is not a de Polignac number, because 213540787 - 2¹⁹ = 213016499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213540781) 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, 2271664 + ... + 2271757.

It is an arithmetic number, because the mean of its divisors is an integer number (54521064).

Almost surely, 2^213540787 is an apocalyptic number.

213540787 is a deficient number, since it is larger than the sum of its proper divisors (4543469).

213540787 is an equidigital number, since it uses as much as digits as its factorization.

213540787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543468.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 213540787 is about 14613.0348319574. The cubic root of 213540787 is about 597.7142542609.

The spelling of 213540787 in words is "two hundred thirteen million, five hundred forty thousand, seven hundred eighty-seven".