420311261 has 4 divisors (see below), whose sum is σ = 420355392. Its totient is φ = 420267132.

The previous prime is 420311249. The next prime is 420311279. The reversal of 420311261 is 162113024.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420311261 is a prime.

It is a super-2 number, since 2×420311261² = 353323112246820242, 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 (420311201) 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, 1205 + ... + 29018.

It is an arithmetic number, because the mean of its divisors is an integer number (105088848).

Almost surely, 2^420311261 is an apocalyptic number.

It is an amenable number.

420311261 is a deficient number, since it is larger than the sum of its proper divisors (44131).

420311261 is a wasteful number, since it uses less digits than its factorization.

420311261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44130.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 420311261 is about 20501.4941162833. The cubic root of 420311261 is about 749.0721925563.

Adding to 420311261 its reverse (162113024), we get a palindrome (582424285).

The spelling of 420311261 in words is "four hundred twenty million, three hundred eleven thousand, two hundred sixty-one".