51551701 has 4 divisors (see below), whose sum is σ = 54584172. Its totient is φ = 48519232.

The previous prime is 51551699. The next prime is 51551707. The reversal of 51551701 is 10715515.

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 16208676 + 35343025 = 4026^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551701 - 2¹ = 51551699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516210 + ... + 1516243.

It is an arithmetic number, because the mean of its divisors is an integer number (13646043).

Almost surely, 2^51551701 is an apocalyptic number.

It is an amenable number.

51551701 is a deficient number, since it is larger than the sum of its proper divisors (3032471).

51551701 is a wasteful number, since it uses less digits than its factorization.

51551701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032470.

The product of its (nonzero) digits is 875, while the sum is 25.

The square root of 51551701 is about 7179.9513229548. The cubic root of 51551701 is about 372.1754024062.

The spelling of 51551701 in words is "fifty-one million, five hundred fifty-one thousand, seven hundred one".