51658471 has 4 divisors (see below), whose sum is σ = 51683472. Its totient is φ = 51633472.

The previous prime is 51658463. The next prime is 51658487. The reversal of 51658471 is 17485615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51658471 - 2³ = 51658463 is a prime.

It is a super-3 number, since 3×51658471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51658471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091 + ... + 13636.

It is an arithmetic number, because the mean of its divisors is an integer number (12920868).

Almost surely, 2^51658471 is an apocalyptic number.

51658471 is the 4546-th heptagonal number.

51658471 is a deficient number, since it is larger than the sum of its proper divisors (25001).

51658471 is a wasteful number, since it uses less digits than its factorization.

51658471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25000.

The product of its digits is 33600, while the sum is 37.

The square root of 51658471 is about 7187.3827642613. The cubic root of 51658471 is about 372.4321657779.

The spelling of 51658471 in words is "fifty-one million, six hundred fifty-eight thousand, four hundred seventy-one".