421561741 has 4 divisors (see below), whose sum is σ = 424638972. Its totient is φ = 418484512.

The previous prime is 421561739. The next prime is 421561769. The reversal of 421561741 is 147165124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98604900 + 322956841 = 9930^2 + 17971^2 .

It is a cyclic number.

It is not a de Polignac number, because 421561741 - 2¹ = 421561739 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 (421561771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538410 + ... + 1538683.

It is an arithmetic number, because the mean of its divisors is an integer number (106159743).

Almost surely, 2^421561741 is an apocalyptic number.

It is an amenable number.

421561741 is a deficient number, since it is larger than the sum of its proper divisors (3077231).

421561741 is a wasteful number, since it uses less digits than its factorization.

421561741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077230.

The product of its digits is 6720, while the sum is 31.

The square root of 421561741 is about 20531.9687560643. The cubic root of 421561741 is about 749.8143190710.

It can be divided in two parts, 4215 and 61741, that added together give a palindrome (65956).

The spelling of 421561741 in words is "four hundred twenty-one million, five hundred sixty-one thousand, seven hundred forty-one".