51641477 has 4 divisors (see below), whose sum is σ = 51780300. Its totient is φ = 51502656.

The previous prime is 51641437. The next prime is 51641479. The reversal of 51641477 is 77414615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77414615 = 5 ⋅15482923.

It can be written as a sum of positive squares in 2 ways, for example, as 38925121 + 12716356 = 6239^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 51641477 - 2¹⁶ = 51575941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51641479) 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, 68852 + ... + 69597.

It is an arithmetic number, because the mean of its divisors is an integer number (12945075).

Almost surely, 2^51641477 is an apocalyptic number.

It is an amenable number.

51641477 is a deficient number, since it is larger than the sum of its proper divisors (138823).

51641477 is a wasteful number, since it uses less digits than its factorization.

51641477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138822.

The product of its digits is 23520, while the sum is 35.

The square root of 51641477 is about 7186.2004564304. The cubic root of 51641477 is about 372.3913218385.

The spelling of 51641477 in words is "fifty-one million, six hundred forty-one thousand, four hundred seventy-seven".