215234993 has 2 divisors, whose sum is σ = 215234994. Its totient is φ = 215234992.

The previous prime is 215234963. The next prime is 215235037. The reversal of 215234993 is 399432512.

It is a happy number.

215234993 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., 201157489 + 14077504 = 14183^2 + 3752^2 .

It is a cyclic number.

It is not a de Polignac number, because 215234993 - 2²⁶ = 148126129 is a prime.

It is a super-2 number, since 2×215234993² = 92652204423420098, which contains 22 as substring.

It is equal to p_11874566 and since 215234993 and 11874566 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (215234933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107617496 + 107617497.

It is an arithmetic number, because the mean of its divisors is an integer number (107617497).

Almost surely, 2^215234993 is an apocalyptic number.

It is an amenable number.

215234993 is a deficient number, since it is larger than the sum of its proper divisors (1).

215234993 is an equidigital number, since it uses as much as digits as its factorization.

215234993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 38.

The square root of 215234993 is about 14670.8893050149. The cubic root of 215234993 is about 599.2908222937.

The spelling of 215234993 in words is "two hundred fifteen million, two hundred thirty-four thousand, nine hundred ninety-three".