101222509 has 2 divisors, whose sum is σ = 101222510. Its totient is φ = 101222508.

The previous prime is 101222501. The next prime is 101222543. The reversal of 101222509 is 905222101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100701225 + 521284 = 10035^2 + 722^2 .

It is a cyclic number.

It is not a de Polignac number, because 101222509 - 2³ = 101222501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101222509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101222501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50611254 + 50611255.

It is an arithmetic number, because the mean of its divisors is an integer number (50611255).

Almost surely, 2^101222509 is an apocalyptic number.

It is an amenable number.

101222509 is a deficient number, since it is larger than the sum of its proper divisors (1).

101222509 is an equidigital number, since it uses as much as digits as its factorization.

101222509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 101222509 is about 10060.9397672384. The cubic root of 101222509 is about 466.0426889000.

The spelling of 101222509 in words is "one hundred one million, two hundred twenty-two thousand, five hundred nine".