51031470 has 64 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 11377920.

The previous prime is 51031451. The next prime is 51031481. The reversal of 51031470 is 7413015.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5647 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (2240784).

Almost surely, 2^51031470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51031470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71705088).

51031470 is an abundant number, since it is smaller than the sum of its proper divisors (92378706).

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

51031470 is a wasteful number, since it uses less digits than its factorization.

51031470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51031470 is about 7143.6314294622. The cubic root of 51031470 is about 370.9192385532.

Adding to 51031470 its reverse (7413015), we get a palindrome (58444485).

The spelling of 51031470 in words is "fifty-one million, thirty-one thousand, four hundred seventy".