51661502 has 4 divisors (see below), whose sum is σ = 77492256. Its totient is φ = 25830750.

The previous prime is 51661501. The next prime is 51661529. The reversal of 51661502 is 20516615.

51661502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51661501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12915374 + ... + 12915377.

It is an arithmetic number, because the mean of its divisors is an integer number (19373064).

Almost surely, 2^51661502 is an apocalyptic number.

51661502 is a deficient number, since it is larger than the sum of its proper divisors (25830754).

51661502 is a wasteful number, since it uses less digits than its factorization.

51661502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25830753.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51661502 is about 7187.5936167816. The cubic root of 51661502 is about 372.4394496418.

The spelling of 51661502 in words is "fifty-one million, six hundred sixty-one thousand, five hundred two".