51025405 has 8 divisors (see below), whose sum is σ = 62885592. Its totient is φ = 39716928.

The previous prime is 51025399. The next prime is 51025423. The reversal of 51025405 is 50452015.

It can be written as a sum of positive squares in 4 ways, for example, as 8892324 + 42133081 = 2982^2 + 6491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51025405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137722 + ... + 138091.

It is an arithmetic number, because the mean of its divisors is an integer number (7860699).

Almost surely, 2^51025405 is an apocalyptic number.

It is an amenable number.

51025405 is a deficient number, since it is larger than the sum of its proper divisors (11860187).

51025405 is a wasteful number, since it uses less digits than its factorization.

51025405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275855.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51025405 is about 7143.2069128648. The cubic root of 51025405 is about 370.9045436057.

The spelling of 51025405 in words is "fifty-one million, twenty-five thousand, four hundred five".