61407009 has 18 divisors (see below), whose sum is σ = 94227510. Its totient is φ = 38528256.

The previous prime is 61406981. The next prime is 61407029. The reversal of 61407009 is 90070416.

It can be written as a sum of positive squares in 3 ways, for example, as 13838400 + 47568609 = 3720^2 + 6897^2 .

It is not a de Polignac number, because 61407009 - 2⁹ = 61406497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61407029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9204 + ... + 14405.

Almost surely, 2^61407009 is an apocalyptic number.

It is an amenable number.

61407009 is a deficient number, since it is larger than the sum of its proper divisors (32820501).

61407009 is a wasteful number, since it uses less digits than its factorization.

61407009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23649 (or 23629 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 61407009 is about 7836.2624381780. The cubic root of 61407009 is about 394.5232918149.

The spelling of 61407009 in words is "sixty-one million, four hundred seven thousand, nine".