61290421 has 4 divisors (see below), whose sum is σ = 62295244. Its totient is φ = 60285600.

The previous prime is 61290413. The next prime is 61290433. The reversal of 61290421 is 12409216.

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 31979025 + 29311396 = 5655^2 + 5414^2 .

It is a cyclic number.

It is not a de Polignac number, because 61290421 - 2³ = 61290413 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 (61291421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502320 + ... + 502441.

It is an arithmetic number, because the mean of its divisors is an integer number (15573811).

Almost surely, 2^61290421 is an apocalyptic number.

61290421 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

61290421 is a deficient number, since it is larger than the sum of its proper divisors (1004823).

61290421 is a wasteful number, since it uses less digits than its factorization.

61290421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004822.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61290421 is about 7828.8198982988. The cubic root of 61290421 is about 394.2734515932.

Adding to 61290421 its reverse (12409216), we get a palindrome (73699637).

It can be divided in two parts, 61 and 290421, that multiplied together give a square (17715681 = 4209²).

The spelling of 61290421 in words is "sixty-one million, two hundred ninety thousand, four hundred twenty-one".