51785501 has 8 divisors (see below), whose sum is σ = 53189304. Its totient is φ = 50388480.

The previous prime is 51785497. The next prime is 51785521. The reversal of 51785501 is 10558715.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3496900 + 48288601 = 1870^2 + 6949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51785501 - 2² = 51785497 is a prime.

It is a super-2 number, since 2×51785501² = 5363476227642002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51785521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16295 + ... + 19211.

It is an arithmetic number, because the mean of its divisors is an integer number (6648663).

Almost surely, 2^51785501 is an apocalyptic number.

It is an amenable number.

51785501 is a deficient number, since it is larger than the sum of its proper divisors (1403803).

51785501 is a wasteful number, since it uses less digits than its factorization.

51785501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 51785501 is about 7196.2143520048. The cubic root of 51785501 is about 372.7371904974.

The spelling of 51785501 in words is "fifty-one million, seven hundred eighty-five thousand, five hundred one".