215422973 has 2 divisors, whose sum is σ = 215422974. Its totient is φ = 215422972.

The previous prime is 215422957. The next prime is 215423027. The reversal of 215422973 is 379224512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202151524 + 13271449 = 14218^2 + 3643^2 .

It is a cyclic number.

It is not a de Polignac number, because 215422973 - 2⁴ = 215422957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215422943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107711486 + 107711487.

It is an arithmetic number, because the mean of its divisors is an integer number (107711487).

Almost surely, 2^215422973 is an apocalyptic number.

It is an amenable number.

215422973 is a deficient number, since it is larger than the sum of its proper divisors (1).

215422973 is an equidigital number, since it uses as much as digits as its factorization.

215422973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 215422973 is about 14677.2944713936. The cubic root of 215422973 is about 599.4652392673.

The spelling of 215422973 in words is "two hundred fifteen million, four hundred twenty-two thousand, nine hundred seventy-three".