51513646 has 8 divisors (see below), whose sum is σ = 78537384. Its totient is φ = 25334520.

The previous prime is 51513619. The next prime is 51513647. The reversal of 51513646 is 64631515.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51513647) 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, 211000 + ... + 211243.

It is an arithmetic number, because the mean of its divisors is an integer number (9817173).

Almost surely, 2^51513646 is an apocalyptic number.

51513646 is a deficient number, since it is larger than the sum of its proper divisors (27023738).

51513646 is a wasteful number, since it uses less digits than its factorization.

51513646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422306.

The product of its digits is 10800, while the sum is 31.

The square root of 51513646 is about 7177.3007461023. The cubic root of 51513646 is about 372.0838010227.

It can be divided in two parts, 515 and 13646, that added together give a square (14161 = 119²).

The spelling of 51513646 in words is "fifty-one million, five hundred thirteen thousand, six hundred forty-six".