263385997 has 4 divisors (see below), whose sum is σ = 301012576. Its totient is φ = 225759420.

The previous prime is 263385989. The next prime is 263386001. The reversal of 263385997 is 799583362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263385997 - 2³ = 263385989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263385197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18813279 + ... + 18813292.

It is an arithmetic number, because the mean of its divisors is an integer number (75253144).

Almost surely, 2^263385997 is an apocalyptic number.

It is an amenable number.

263385997 is a deficient number, since it is larger than the sum of its proper divisors (37626579).

263385997 is an equidigital number, since it uses as much as digits as its factorization.

263385997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37626578.

The product of its digits is 2449440, while the sum is 52.

The square root of 263385997 is about 16229.1711741543. The cubic root of 263385997 is about 641.0091476925.

The spelling of 263385997 in words is "two hundred sixty-three million, three hundred eighty-five thousand, nine hundred ninety-seven".