421961 has 4 divisors (see below), whose sum is σ = 423300. Its totient is φ = 420624.

The previous prime is 421943. The next prime is 421973. The reversal of 421961 is 169124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 126025 = 544^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 421961 - 2¹⁴ = 405577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421361) 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, 95 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (105825).

2⁴²¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

421961 is a deficient number, since it is larger than the sum of its proper divisors (1339).

421961 is an equidigital number, since it uses as much as digits as its factorization.

421961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338.

The product of its digits is 432, while the sum is 23.

The square root of 421961 is about 649.5852522956. The cubic root of 421961 is about 75.0050959500.

The spelling of 421961 in words is "four hundred twenty-one thousand, nine hundred sixty-one".