221162957 has 2 divisors, whose sum is σ = 221162958. Its totient is φ = 221162956.

The previous prime is 221162899. The next prime is 221162969. The reversal of 221162957 is 759261122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181144681 + 40018276 = 13459^2 + 6326^2 .

It is a cyclic number.

It is not a de Polignac number, because 221162957 - 2⁸ = 221162701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221167957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110581478 + 110581479.

It is an arithmetic number, because the mean of its divisors is an integer number (110581479).

Almost surely, 2^221162957 is an apocalyptic number.

It is an amenable number.

221162957 is a deficient number, since it is larger than the sum of its proper divisors (1).

221162957 is an equidigital number, since it uses as much as digits as its factorization.

221162957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 221162957 is about 14871.5485743752. The cubic root of 221162957 is about 604.7429247254.

The spelling of 221162957 in words is "two hundred twenty-one million, one hundred sixty-two thousand, nine hundred fifty-seven".