215401873 has 2 divisors, whose sum is σ = 215401874. Its totient is φ = 215401872.

The previous prime is 215401871. The next prime is 215401897. The reversal of 215401873 is 378104512.

215401873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214095424 + 1306449 = 14632^2 + 1143^2 .

It is a cyclic number.

It is not a de Polignac number, because 215401873 - 2¹ = 215401871 is a prime.

Together with 215401871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (215401871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107700936 + 107700937.

It is an arithmetic number, because the mean of its divisors is an integer number (107700937).

Almost surely, 2^215401873 is an apocalyptic number.

It is an amenable number.

215401873 is a deficient number, since it is larger than the sum of its proper divisors (1).

215401873 is an equidigital number, since it uses as much as digits as its factorization.

215401873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 215401873 is about 14676.5756564670. The cubic root of 215401873 is about 599.4456667191.

The spelling of 215401873 in words is "two hundred fifteen million, four hundred one thousand, eight hundred seventy-three".