51023140 has 24 divisors (see below), whose sum is σ = 122455872. Its totient is φ = 17493600.

The previous prime is 51023129. The next prime is 51023183. The reversal of 51023140 is 4132015.

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, 182086 + ... + 182365.

It is an arithmetic number, because the mean of its divisors is an integer number (5102328).

Almost surely, 2^51023140 is an apocalyptic number.

It is an amenable number.

51023140 is an abundant number, since it is smaller than the sum of its proper divisors (71432732).

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

51023140 is a wasteful number, since it uses less digits than its factorization.

51023140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364467 (or 364465 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51023140 is about 7143.0483688689. The cubic root of 51023140 is about 370.8990554166.

Adding to 51023140 its reverse (4132015), we get a palindrome (55155155).

The spelling of 51023140 in words is "fifty-one million, twenty-three thousand, one hundred forty".