220947451 has 2 divisors, whose sum is σ = 220947452. Its totient is φ = 220947450.

The previous prime is 220947449. The next prime is 220947479. The reversal of 220947451 is 154749022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220947451 - 2¹ = 220947449 is a prime.

It is a super-2 number, since 2×220947451² = 97635552206794802, which contains 22 as substring.

Together with 220947449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (220917451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110473725 + 110473726.

It is an arithmetic number, because the mean of its divisors is an integer number (110473726).

Almost surely, 2^220947451 is an apocalyptic number.

220947451 is a deficient number, since it is larger than the sum of its proper divisors (1).

220947451 is an equidigital number, since it uses as much as digits as its factorization.

220947451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 220947451 is about 14864.3012281103. The cubic root of 220947451 is about 604.5464360002.

The spelling of 220947451 in words is "two hundred twenty million, nine hundred forty-seven thousand, four hundred fifty-one".