214731661 has 4 divisors (see below), whose sum is σ = 214984252. Its totient is φ = 214479072.

The previous prime is 214731659. The next prime is 214731667. The reversal of 214731661 is 166137412.

214731661 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.

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 192932100 = 4669^2 + 13890^2 .

It is a cyclic number.

It is not a de Polignac number, because 214731661 - 2¹ = 214731659 is a prime.

It is a super-2 number, since 2×214731661² = 92219372471637842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214731667) 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, 125016 + ... + 126721.

It is an arithmetic number, because the mean of its divisors is an integer number (53746063).

Almost surely, 2^214731661 is an apocalyptic number.

It is an amenable number.

214731661 is a deficient number, since it is larger than the sum of its proper divisors (252591).

214731661 is an equidigital number, since it uses as much as digits as its factorization.

214731661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252590.

The product of its digits is 6048, while the sum is 31.

The square root of 214731661 is about 14653.7251577884. The cubic root of 214731661 is about 598.8233058638.

It can be divided in two parts, 21473 and 1661, that multiplied together give a palindrome (35666653).

The spelling of 214731661 in words is "two hundred fourteen million, seven hundred thirty-one thousand, six hundred sixty-one".