215461963 has 2 divisors, whose sum is σ = 215461964. Its totient is φ = 215461962.

The previous prime is 215461913. The next prime is 215461973. The reversal of 215461963 is 369164512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215461963 is a prime.

It is not a weakly prime, because it can be changed into another prime (215461903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107730981 + 107730982.

It is an arithmetic number, because the mean of its divisors is an integer number (107730982).

Almost surely, 2^215461963 is an apocalyptic number.

215461963 is a deficient number, since it is larger than the sum of its proper divisors (1).

215461963 is an equidigital number, since it uses as much as digits as its factorization.

215461963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 215461963 is about 14678.6226533691. The cubic root of 215461963 is about 599.5014033764.

The spelling of 215461963 in words is "two hundred fifteen million, four hundred sixty-one thousand, nine hundred sixty-three".