220506157 has 2 divisors, whose sum is σ = 220506158. Its totient is φ = 220506156.

The previous prime is 220506149. The next prime is 220506197. The reversal of 220506157 is 751605022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123010281 + 97495876 = 11091^2 + 9874^2 .

It is a cyclic number.

It is not a de Polignac number, because 220506157 - 2³ = 220506149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220506137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110253078 + 110253079.

It is an arithmetic number, because the mean of its divisors is an integer number (110253079).

Almost surely, 2^220506157 is an apocalyptic number.

It is an amenable number.

220506157 is a deficient number, since it is larger than the sum of its proper divisors (1).

220506157 is an equidigital number, since it uses as much as digits as its factorization.

220506157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 220506157 is about 14849.4497204442. The cubic root of 220506157 is about 604.1436848418.

The spelling of 220506157 in words is "two hundred twenty million, five hundred six thousand, one hundred fifty-seven".