51436646 has 4 divisors (see below), whose sum is σ = 77154972. Its totient is φ = 25718322.

The previous prime is 51436631. The next prime is 51436661. The reversal of 51436646 is 64663415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64663415 = 5 ⋅12932683.

It is an interprime number because it is at equal distance from previous prime (51436631) and next prime (51436661).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12859160 + ... + 12859163.

It is an arithmetic number, because the mean of its divisors is an integer number (19288743).

Almost surely, 2^51436646 is an apocalyptic number.

51436646 is a deficient number, since it is larger than the sum of its proper divisors (25718326).

51436646 is a wasteful number, since it uses less digits than its factorization.

51436646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25718325.

The product of its digits is 51840, while the sum is 35.

The square root of 51436646 is about 7171.9346065061. The cubic root of 51436646 is about 371.8983178750.

The spelling of 51436646 in words is "fifty-one million, four hundred thirty-six thousand, six hundred forty-six".