51891030 has 40 divisors (see below), whose sum is σ = 139531392. Its totient is φ = 13837392.

The previous prime is 51891029. The next prime is 51891043. The reversal of 51891030 is 3019815.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51890985 and 51891003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31222 + ... + 32841.

Almost surely, 2^51891030 is an apocalyptic number.

51891030 is an abundant number, since it is smaller than the sum of its proper divisors (87640362).

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

51891030 is a wasteful number, since it uses less digits than its factorization.

51891030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64082 (or 64073 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 51891030 is about 7203.5428783342. The cubic root of 51891030 is about 372.9902078711.

The spelling of 51891030 in words is "fifty-one million, eight hundred ninety-one thousand, thirty".