51011620 has 24 divisors (see below), whose sum is σ = 116863488. Its totient is φ = 18549600.

The previous prime is 51011617. The next prime is 51011629. The reversal of 51011620 is 2611015.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51011594 and 51011603.

It is not an unprimeable number, because it can be changed into a prime (51011629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115716 + ... + 116155.

It is an arithmetic number, because the mean of its divisors is an integer number (4869312).

Almost surely, 2^51011620 is an apocalyptic number.

It is an amenable number.

51011620 is an abundant number, since it is smaller than the sum of its proper divisors (65851868).

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

51011620 is a wasteful number, since it uses less digits than its factorization.

51011620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231891 (or 231889 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 51011620 is about 7142.2419449358. The cubic root of 51011620 is about 370.8711394636.

Adding to 51011620 its reverse (2611015), we get a palindrome (53622635).

The spelling of 51011620 in words is "fifty-one million, eleven thousand, six hundred twenty".