56351709 has 6 divisors (see below), whose sum is σ = 81396926. Its totient is φ = 37567800.

The previous prime is 56351677. The next prime is 56351717. The reversal of 56351709 is 90715365.

It is a happy number.

56351709 is a `hidden beast` number, since 5 + 635 + 17 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55086084 + 1265625 = 7422^2 + 1125^2 .

It is not a de Polignac number, because 56351709 - 2⁵ = 56351677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56351509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3130642 + ... + 3130659.

Almost surely, 2^56351709 is an apocalyptic number.

It is an amenable number.

56351709 is a deficient number, since it is larger than the sum of its proper divisors (25045217).

56351709 is a wasteful number, since it uses less digits than its factorization.

56351709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6261307 (or 6261304 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 56351709 is about 7506.7775376655. Note that the first 3 decimals coincide. The cubic root of 56351709 is about 383.3855121578.

The spelling of 56351709 in words is "fifty-six million, three hundred fifty-one thousand, seven hundred nine".