103161221 has 2 divisors, whose sum is σ = 103161222. Its totient is φ = 103161220.

The previous prime is 103161209. The next prime is 103161229. The reversal of 103161221 is 122161301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99720196 + 3441025 = 9986^2 + 1855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103161221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 103161221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103161229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51580610 + 51580611.

It is an arithmetic number, because the mean of its divisors is an integer number (51580611).

Almost surely, 2^103161221 is an apocalyptic number.

It is an amenable number.

103161221 is a deficient number, since it is larger than the sum of its proper divisors (1).

103161221 is an equidigital number, since it uses as much as digits as its factorization.

103161221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 103161221 is about 10156.8312479828. The cubic root of 103161221 is about 468.9992604738. Note that the first 3 decimals are identical.

The spelling of 103161221 in words is "one hundred three million, one hundred sixty-one thousand, two hundred twenty-one".