51451405 has 4 divisors (see below), whose sum is σ = 61741692. Its totient is φ = 41161120.

The previous prime is 51451369. The next prime is 51451409. The reversal of 51451405 is 50415415.

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: 50415415 = 5 ⋅10083083.

It can be written as a sum of positive squares in 2 ways, for example, as 8168164 + 43283241 = 2858^2 + 6579^2 .

It is not a de Polignac number, because 51451405 - 2⁷ = 51451277 is a prime.

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 51451405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451409) 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, 5145136 + ... + 5145145.

It is an arithmetic number, because the mean of its divisors is an integer number (15435423).

Almost surely, 2^51451405 is an apocalyptic number.

It is an amenable number.

51451405 is a deficient number, since it is larger than the sum of its proper divisors (10290287).

51451405 is a wasteful number, since it uses less digits than its factorization.

51451405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290286.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 51451405 is about 7172.9634740461. The cubic root of 51451405 is about 371.9338847506.

The spelling of 51451405 in words is "fifty-one million, four hundred fifty-one thousand, four hundred five".