51405826 has 4 divisors (see below), whose sum is σ = 77108742. Its totient is φ = 25702912.

The previous prime is 51405791. The next prime is 51405857. The reversal of 51405826 is 62850415.

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

It can be written as a sum of positive squares in only one way, i.e., 50395801 + 1010025 = 7099^2 + 1005^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12851455 + ... + 12851458.

Almost surely, 2^51405826 is an apocalyptic number.

51405826 is a deficient number, since it is larger than the sum of its proper divisors (25702916).

51405826 is a wasteful number, since it uses less digits than its factorization.

51405826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25702915.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 51405826 is about 7169.7856313840. The cubic root of 51405826 is about 371.8240245642.

The spelling of 51405826 in words is "fifty-one million, four hundred five thousand, eight hundred twenty-six".