51531447 has 8 divisors (see below), whose sum is σ = 74954880. Its totient is φ = 31231160.

The previous prime is 51531433. The next prime is 51531451. The reversal of 51531447 is 74413515.

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

It is a cyclic number.

It is not a de Polignac number, because 51531447 - 2⁸ = 51531191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531407) 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, 780747 + ... + 780812.

It is an arithmetic number, because the mean of its divisors is an integer number (9369360).

Almost surely, 2^51531447 is an apocalyptic number.

51531447 is a deficient number, since it is larger than the sum of its proper divisors (23423433).

51531447 is a wasteful number, since it uses less digits than its factorization.

51531447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561573.

The product of its digits is 8400, while the sum is 30.

The square root of 51531447 is about 7178.5407291454. The cubic root of 51531447 is about 372.1266550460.

The spelling of 51531447 in words is "fifty-one million, five hundred thirty-one thousand, four hundred forty-seven".