61404921 has 12 divisors (see below), whose sum is σ = 90859860. Its totient is φ = 39937920.

The previous prime is 61404913. The next prime is 61404923. The reversal of 61404921 is 12940416.

61404921 is a `hidden beast` number, since 614 + 0 + 49 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 58293225 = 1764^2 + 7635^2 .

It is not a de Polignac number, because 61404921 - 2³ = 61404913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61404923) 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 11 ways as a sum of consecutive naturals, for example, 82836 + ... + 83573.

It is an arithmetic number, because the mean of its divisors is an integer number (7571655).

Almost surely, 2^61404921 is an apocalyptic number.

It is an amenable number.

61404921 is a deficient number, since it is larger than the sum of its proper divisors (29454939).

61404921 is a wasteful number, since it uses less digits than its factorization.

61404921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166456 (or 166453 counting only the distinct ones).

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

The square root of 61404921 is about 7836.1292102670. The cubic root of 61404921 is about 394.5188201540.

The spelling of 61404921 in words is "sixty-one million, four hundred four thousand, nine hundred twenty-one".