526742221 has 4 divisors (see below), whose sum is σ = 527383072. Its totient is φ = 526101372.

The previous prime is 526742179. The next prime is 526742239. The reversal of 526742221 is 122247625.

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 not a de Polignac number, because 526742221 - 2²⁷ = 392524493 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 (526742291) 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, 319191 + ... + 320836.

It is an arithmetic number, because the mean of its divisors is an integer number (131845768).

Almost surely, 2^526742221 is an apocalyptic number.

It is an amenable number.

526742221 is a deficient number, since it is larger than the sum of its proper divisors (640851).

526742221 is an equidigital number, since it uses as much as digits as its factorization.

526742221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640850.

The product of its digits is 13440, while the sum is 31.

The square root of 526742221 is about 22950.8653649487. The cubic root of 526742221 is about 807.6057025664.

Adding to 526742221 its reverse (122247625), we get a palindrome (648989846).

The spelling of 526742221 in words is "five hundred twenty-six million, seven hundred forty-two thousand, two hundred twenty-one".