61409421 has 10 divisors (see below), whose sum is σ = 91735182. Its totient is φ = 40939560.

The previous prime is 61409399. The next prime is 61409429. The reversal of 61409421 is 12490416.

61409421 is a `hidden beast` number, since 614 + 0 + 9 + 42 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54597321 + 6812100 = 7389^2 + 2610^2 .

It is not a de Polignac number, because 61409421 - 2²² = 57215117 is a prime.

It is a super-2 number, since 2×61409421² = 7542233975110482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61409429) 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 9 ways as a sum of consecutive naturals, for example, 378990 + ... + 379151.

Almost surely, 2^61409421 is an apocalyptic number.

It is an amenable number.

61409421 is a deficient number, since it is larger than the sum of its proper divisors (30325761).

61409421 is an equidigital number, since it uses as much as digits as its factorization.

61409421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758153 (or 758144 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61409421 is about 7836.4163365661. The cubic root of 61409421 is about 394.5284572281.

Adding to 61409421 its reverse (12490416), we get a palindrome (73899837).

The spelling of 61409421 in words is "sixty-one million, four hundred nine thousand, four hundred twenty-one".