51111264 has 48 divisors (see below), whose sum is σ = 134543808. Its totient is φ = 16989312.

The previous prime is 51111259. The next prime is 51111271. The reversal of 51111264 is 46211115.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×51111264² = 5224722615355392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51111264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55899 + ... + 56805.

It is an arithmetic number, because the mean of its divisors is an integer number (2802996).

Almost surely, 2^51111264 is an apocalyptic number.

It is an amenable number.

51111264 is an abundant number, since it is smaller than the sum of its proper divisors (83432544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111264 is a wasteful number, since it uses less digits than its factorization.

51111264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1499 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 51111264 is about 7149.2142225562. The cubic root of 51111264 is about 371.1124638764.

Adding to 51111264 its reverse (46211115), we get a palindrome (97322379).

The spelling of 51111264 in words is "fifty-one million, one hundred eleven thousand, two hundred sixty-four".