213740537691 has 8 divisors (see below), whose sum is σ = 285022990144. Its totient is φ = 142475888520.

The previous prime is 213740537669. The next prime is 213740537707. The reversal of 213740537691 is 196735047312.

It is a happy number.

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

It is not a de Polignac number, because 213740537691 - 2⁶ = 213740537627 is a prime.

It is a super-2 number, since 2×213740537691² (a number of 23 digits) contains 22 as substring.

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 213740537691.

It is not an unprimeable number, because it can be changed into a prime (213740530691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4422781 + ... + 4470846.

It is an arithmetic number, because the mean of its divisors is an integer number (35627873768).

Almost surely, 2^213740537691 is an apocalyptic number.

213740537691 is a deficient number, since it is larger than the sum of its proper divisors (71282452453).

213740537691 is an equidigital number, since it uses as much as digits as its factorization.

213740537691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901641.

The product of its (nonzero) digits is 952560, while the sum is 48.

The spelling of 213740537691 in words is "two hundred thirteen billion, seven hundred forty million, five hundred thirty-seven thousand, six hundred ninety-one".