220240997 has 2 divisors, whose sum is σ = 220240998. Its totient is φ = 220240996.

The previous prime is 220240973. The next prime is 220241009. The reversal of 220240997 is 799042022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172160641 + 48080356 = 13121^2 + 6934^2 .

It is a cyclic number.

It is not a de Polignac number, because 220240997 - 2¹⁸ = 219978853 is a prime.

It is a super-3 number, since 3×220240997³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220246997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110120498 + 110120499.

It is an arithmetic number, because the mean of its divisors is an integer number (110120499).

Almost surely, 2^220240997 is an apocalyptic number.

It is an amenable number.

220240997 is a deficient number, since it is larger than the sum of its proper divisors (1).

220240997 is an equidigital number, since it uses as much as digits as its factorization.

220240997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 220240997 is about 14840.5187577793. The cubic root of 220240997 is about 603.9014255532.

The spelling of 220240997 in words is "two hundred twenty million, two hundred forty thousand, nine hundred ninety-seven".