51445431 has 12 divisors (see below), whose sum is σ = 74646208. Its totient is φ = 34141824.

The previous prime is 51445423. The next prime is 51445439. The reversal of 51445431 is 13454415.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51445423) and next prime (51445439).

It is not a de Polignac number, because 51445431 - 2³ = 51445423 is a prime.

It is a super-2 number, since 2×51445431² = 5293264741551522, 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 = 51445395 and 51445404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10810 + ... + 14823.

Almost surely, 2^51445431 is an apocalyptic number.

51445431 is a deficient number, since it is larger than the sum of its proper divisors (23200777).

51445431 is a wasteful number, since it uses less digits than its factorization.

51445431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25862 (or 25859 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 51445431 is about 7172.5470371410. The cubic root of 51445431 is about 371.9194891669.

Adding to 51445431 its reverse (13454415), we get a palindrome (64899846).

The spelling of 51445431 in words is "fifty-one million, four hundred forty-five thousand, four hundred thirty-one".