51111948 has 24 divisors (see below), whose sum is σ = 122485552. Its totient is φ = 16576704.

The previous prime is 51111947. The next prime is 51111989. The reversal of 51111948 is 84911115.

It is a happy number.

It is a super-2 number, since 2×51111948² = 5224862456709408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51111941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57115 + ... + 58002.

Almost surely, 2^51111948 is an apocalyptic number.

It is an amenable number.

51111948 is an abundant number, since it is smaller than the sum of its proper divisors (71373604).

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

51111948 is a wasteful number, since it uses less digits than its factorization.

51111948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115161 (or 115159 counting only the distinct ones).

The product of its digits is 1440, while the sum is 30.

The square root of 51111948 is about 7149.2620598213. The cubic root of 51111948 is about 371.1141193483.

The spelling of 51111948 in words is "fifty-one million, one hundred eleven thousand, nine hundred forty-eight".