215401801 has 2 divisors, whose sum is σ = 215401802. Its totient is φ = 215401800.

The previous prime is 215401793. The next prime is 215401847. The reversal of 215401801 is 108104512.

215401801 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., 167029776 + 48372025 = 12924^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 215401801 - 2³ = 215401793 is a prime.

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, 107700900 + 107700901.

It is an arithmetic number, because the mean of its divisors is an integer number (107700901).

Almost surely, 2^215401801 is an apocalyptic number.

It is an amenable number.

215401801 is a deficient number, since it is larger than the sum of its proper divisors (1).

215401801 is an equidigital number, since it uses as much as digits as its factorization.

215401801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 215401801 is about 14676.5732035786. The cubic root of 215401801 is about 599.4455999291.

The spelling of 215401801 in words is "two hundred fifteen million, four hundred one thousand, eight hundred one".