215642263 has 6 divisors (see below), whose sum is σ = 229073576. Its totient is φ = 202957152.

The previous prime is 215642261. The next prime is 215642279. The reversal of 215642263 is 362246512.

It is not a de Polignac number, because 215642263 - 2¹ = 215642261 is a prime.

It is a super-2 number, since 2×215642263² = 93003171183522338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215642261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 372795 + ... + 373372.

Almost surely, 2^215642263 is an apocalyptic number.

215642263 is a deficient number, since it is larger than the sum of its proper divisors (13431313).

215642263 is an equidigital number, since it uses as much as digits as its factorization.

215642263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746201 (or 746184 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 215642263 is about 14684.7629534835. The cubic root of 215642263 is about 599.6685790043.

Adding to 215642263 its reverse (362246512), we get a palindrome (577888775).

The spelling of 215642263 in words is "two hundred fifteen million, six hundred forty-two thousand, two hundred sixty-three".