51225605 has 8 divisors (see below), whose sum is σ = 62970264. Its totient is φ = 39980800.

The previous prime is 51225583. The next prime is 51225611. The reversal of 51225605 is 50652215.

It can be written as a sum of positive squares in 4 ways, for example, as 1635841 + 49589764 = 1279^2 + 7042^2 .

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

It is not a de Polignac number, because 51225605 - 2¹² = 51221509 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, 124736 + ... + 125145.

It is an arithmetic number, because the mean of its divisors is an integer number (7871283).

Almost surely, 2^51225605 is an apocalyptic number.

It is an amenable number.

51225605 is a deficient number, since it is larger than the sum of its proper divisors (11744659).

51225605 is a wasteful number, since it uses less digits than its factorization.

51225605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249927.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 51225605 is about 7157.2065081287. The cubic root of 51225605 is about 371.3889963118.

It can be divided in two parts, 512 and 25605, that multiplied together give a triangular number (13109760 = T₅₁₂₀).

The spelling of 51225605 in words is "fifty-one million, two hundred twenty-five thousand, six hundred five".