213862661 has 4 divisors (see below), whose sum is σ = 213903072. Its totient is φ = 213822252.

The previous prime is 213862603. The next prime is 213862667. The reversal of 213862661 is 166268312.

213862661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213862661 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 (213862667) 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, 10811 + ... + 23336.

It is an arithmetic number, because the mean of its divisors is an integer number (53475768).

Almost surely, 2^213862661 is an apocalyptic number.

It is an amenable number.

213862661 is a deficient number, since it is larger than the sum of its proper divisors (40411).

213862661 is an equidigital number, since it uses as much as digits as its factorization.

213862661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410.

The product of its digits is 20736, while the sum is 35.

The square root of 213862661 is about 14624.0439345620. The cubic root of 213862661 is about 598.0144187677.

The spelling of 213862661 in words is "two hundred thirteen million, eight hundred sixty-two thousand, six hundred sixty-one".