61421405 has 4 divisors (see below), whose sum is σ = 73705692. Its totient is φ = 49137120.

The previous prime is 61421377. The next prime is 61421413. The reversal of 61421405 is 50412416.

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 19456921 + 41964484 = 4411^2 + 6478^2 .

It is not a de Polignac number, because 61421405 - 2⁶ = 61421341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6142136 + ... + 6142145.

It is an arithmetic number, because the mean of its divisors is an integer number (18426423).

Almost surely, 2^61421405 is an apocalyptic number.

It is an amenable number.

61421405 is a deficient number, since it is larger than the sum of its proper divisors (12284287).

61421405 is a wasteful number, since it uses less digits than its factorization.

61421405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12284286.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 61421405 is about 7837.1809344942. The cubic root of 61421405 is about 394.5541195311.

The spelling of 61421405 in words is "sixty-one million, four hundred twenty-one thousand, four hundred five".