263061421 has 4 divisors (see below), whose sum is σ = 300641632. Its totient is φ = 225481212.

The previous prime is 263061391. The next prime is 263061433. The reversal of 263061421 is 124160362.

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 263061421 - 2¹⁹ = 262537133 is a prime.

It is a super-2 number, since 2×263061421² = 138402622437078482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263061481) 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, 18790095 + ... + 18790108.

It is an arithmetic number, because the mean of its divisors is an integer number (75160408).

Almost surely, 2^263061421 is an apocalyptic number.

It is an amenable number.

263061421 is a deficient number, since it is larger than the sum of its proper divisors (37580211).

263061421 is an equidigital number, since it uses as much as digits as its factorization.

263061421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37580210.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 263061421 is about 16219.1683202315. The cubic root of 263061421 is about 640.7457298570.

The spelling of 263061421 in words is "two hundred sixty-three million, sixty-one thousand, four hundred twenty-one".