263421901 has 4 divisors (see below), whose sum is σ = 263606400. Its totient is φ = 263237404.

The previous prime is 263421889. The next prime is 263421937. The reversal of 263421901 is 109124362.

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, and also an emirpimes, since its reverse is a distinct semiprime: 109124362 = 2 ⋅54562181.

It is a cyclic number.

It is not a de Polignac number, because 263421901 - 2⁵ = 263421869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263421901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263421971) 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, 90091 + ... + 92968.

It is an arithmetic number, because the mean of its divisors is an integer number (65901600).

Almost surely, 2^263421901 is an apocalyptic number.

It is an amenable number.

263421901 is a deficient number, since it is larger than the sum of its proper divisors (184499).

263421901 is a wasteful number, since it uses less digits than its factorization.

263421901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184498.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 263421901 is about 16230.2772927637. The cubic root of 263421901 is about 641.0382731927.

The spelling of 263421901 in words is "two hundred sixty-three million, four hundred twenty-one thousand, nine hundred one".