215256403 has 2 divisors, whose sum is σ = 215256404. Its totient is φ = 215256402.

The previous prime is 215256383. The next prime is 215256413. The reversal of 215256403 is 304652512.

215256403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215256403 is a prime.

It is not a weakly prime, because it can be changed into another prime (215256413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107628201 + 107628202.

It is an arithmetic number, because the mean of its divisors is an integer number (107628202).

Almost surely, 2^215256403 is an apocalyptic number.

215256403 is a deficient number, since it is larger than the sum of its proper divisors (1).

215256403 is an equidigital number, since it uses as much as digits as its factorization.

215256403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 215256403 is about 14671.6189631547. The cubic root of 215256403 is about 599.3106926548.

The spelling of 215256403 in words is "two hundred fifteen million, two hundred fifty-six thousand, four hundred three".