263620997 has 4 divisors (see below), whose sum is σ = 265093920. Its totient is φ = 262148076.

The previous prime is 263620957. The next prime is 263621051. The reversal of 263620997 is 799026362.

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 a de Polignac number, because none of the positive numbers 2^k-263620997 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 (263620927) 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, 736193 + ... + 736550.

It is an arithmetic number, because the mean of its divisors is an integer number (66273480).

Almost surely, 2^263620997 is an apocalyptic number.

It is an amenable number.

263620997 is a deficient number, since it is larger than the sum of its proper divisors (1472923).

263620997 is a wasteful number, since it uses less digits than its factorization.

263620997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472922.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 263620997 is about 16236.4096092701. The cubic root of 263620997 is about 641.1997328321.

The spelling of 263620997 in words is "two hundred sixty-three million, six hundred twenty thousand, nine hundred ninety-seven".