263121601 has 4 divisors (see below), whose sum is σ = 269240752. Its totient is φ = 257002452.

The previous prime is 263121571. The next prime is 263121613. The reversal of 263121601 is 106121362.

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 263121601 - 2⁷ = 263121473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263121701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3059511 + ... + 3059596.

It is an arithmetic number, because the mean of its divisors is an integer number (67310188).

Almost surely, 2^263121601 is an apocalyptic number.

It is an amenable number.

263121601 is a deficient number, since it is larger than the sum of its proper divisors (6119151).

263121601 is an equidigital number, since it uses as much as digits as its factorization.

263121601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6119150.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 263121601 is about 16221.0234264056. The cubic root of 263121601 is about 640.7945868094.

Adding to 263121601 its reverse (106121362), we get a palindrome (369242963).

The spelling of 263121601 in words is "two hundred sixty-three million, one hundred twenty-one thousand, six hundred one".