51906545 has 8 divisors (see below), whose sum is σ = 62605224. Its totient is φ = 41313664.

The previous prime is 51906539. The next prime is 51906553. The reversal of 51906545 is 54560915.

It can be written as a sum of positive squares in 4 ways, for example, as 35129329 + 16777216 = 5927^2 + 4096^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51906545 - 2⁴ = 51906529 is a prime.

It is a Duffinian 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, 25364 + ... + 27333.

It is an arithmetic number, because the mean of its divisors is an integer number (7825653).

Almost surely, 2^51906545 is an apocalyptic number.

It is an amenable number.

51906545 is a deficient number, since it is larger than the sum of its proper divisors (10698679).

51906545 is a wasteful number, since it uses less digits than its factorization.

51906545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52899.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 51906545 is about 7204.6196984990. The cubic root of 51906545 is about 373.0273778561.

The spelling of 51906545 in words is "fifty-one million, nine hundred six thousand, five hundred forty-five".