51951616 has 24 divisors (see below), whose sum is σ = 103881960. Its totient is φ = 25974784.

The previous prime is 51951593. The next prime is 51951619. The reversal of 51951616 is 61615915.

It is a super-2 number, since 2×51951616² = 5397940810022912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51951619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636 + ... + 14731.

It is an arithmetic number, because the mean of its divisors is an integer number (4328415).

Almost surely, 2^51951616 is an apocalyptic number.

It is an amenable number.

51951616 is a deficient number, since it is larger than the sum of its proper divisors (51930344).

51951616 is an equidigital number, since it uses as much as digits as its factorization.

51951616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25389 (or 25369 counting only the distinct ones).

The product of its digits is 8100, while the sum is 34.

The square root of 51951616 is about 7207.7469433936. The cubic root of 51951616 is about 373.1353144890.

The spelling of 51951616 in words is "fifty-one million, nine hundred fifty-one thousand, six hundred sixteen".