51205945 has 8 divisors (see below), whose sum is σ = 70225344. Its totient is φ = 35112624.

The previous prime is 51205939. The next prime is 51205949. The reversal of 51205945 is 54950215.

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 51205945 - 2¹¹ = 51203897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51205949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731479 + ... + 731548.

It is an arithmetic number, because the mean of its divisors is an integer number (8778168).

Almost surely, 2^51205945 is an apocalyptic number.

It is an amenable number.

51205945 is a deficient number, since it is larger than the sum of its proper divisors (19019399).

51205945 is a wasteful number, since it uses less digits than its factorization.

51205945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463039.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 51205945 is about 7155.8329354450. The cubic root of 51205945 is about 371.3414781357.

The spelling of 51205945 in words is "fifty-one million, two hundred five thousand, nine hundred forty-five".