51280531 has 8 divisors (see below), whose sum is σ = 52144128. Its totient is φ = 50421000.

The previous prime is 51280513. The next prime is 51280549. The reversal of 51280531 is 13508215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51280513) and next prime (51280549).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(51280531) divides (51280531-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 51280531 - 2⁷ = 51280403 is a prime.

It is a super-2 number, since 2×51280531² = 5259385719283922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51280496 and 51280505.

It is not an unprimeable number, because it can be changed into a prime (51280511) 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, 34126 + ... + 35596.

It is an arithmetic number, because the mean of its divisors is an integer number (6518016).

Almost surely, 2^51280531 is an apocalyptic number.

51280531 is a deficient number, since it is larger than the sum of its proper divisors (863597).

51280531 is a wasteful number, since it uses less digits than its factorization.

51280531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 51280531 is about 7161.0425916901. The cubic root of 51280531 is about 371.5216879317.

Adding to 51280531 its reverse (13508215), we get a palindrome (64788746).

The spelling of 51280531 in words is "fifty-one million, two hundred eighty thousand, five hundred thirty-one".