51531073 has 8 divisors (see below), whose sum is σ = 56389536. Its totient is φ = 46701600.

The previous prime is 51531061. The next prime is 51531079. The reversal of 51531073 is 37013515.

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

It is not a de Polignac number, because 51531073 - 2¹³ = 51522881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51531079) 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, 3436 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (7048692).

Almost surely, 2^51531073 is an apocalyptic number.

It is an amenable number.

51531073 is a deficient number, since it is larger than the sum of its proper divisors (4858463).

51531073 is a wasteful number, since it uses less digits than its factorization.

51531073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14495.

The product of its (nonzero) digits is 1575, while the sum is 25.

The square root of 51531073 is about 7178.5146792355. The cubic root of 51531073 is about 372.1257547821.

Adding to 51531073 its reverse (37013515), we get a palindrome (88544588).

It can be divided in two parts, 5153 and 1073, that added together give a palindrome (6226).

The spelling of 51531073 in words is "fifty-one million, five hundred thirty-one thousand, seventy-three".