263251421 has 8 divisors (see below), whose sum is σ = 265298880. Its totient is φ = 261211392.

The previous prime is 263251393. The next prime is 263251423. The reversal of 263251421 is 124152362.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263251421 - 2¹⁰ = 263250397 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 (263251423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83960 + ... + 87038.

It is an arithmetic number, because the mean of its divisors is an integer number (33162360).

Almost surely, 2^263251421 is an apocalyptic number.

It is an amenable number.

263251421 is a deficient number, since it is larger than the sum of its proper divisors (2047459).

263251421 is a wasteful number, since it uses less digits than its factorization.

263251421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715.

The product of its digits is 2880, while the sum is 26.

The square root of 263251421 is about 16225.0245300277. The cubic root of 263251421 is about 640.8999554241.

The spelling of 263251421 in words is "two hundred sixty-three million, two hundred fifty-one thousand, four hundred twenty-one".