51501946 has 4 divisors (see below), whose sum is σ = 77252922. Its totient is φ = 25750972.

The previous prime is 51501893. The next prime is 51501949. The reversal of 51501946 is 64910515.

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., 44076321 + 7425625 = 6639^2 + 2725^2 .

It is not an unprimeable number, because it can be changed into a prime (51501949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12875485 + ... + 12875488.

Almost surely, 2^51501946 is an apocalyptic number.

51501946 is a deficient number, since it is larger than the sum of its proper divisors (25750976).

51501946 is a wasteful number, since it uses less digits than its factorization.

51501946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25750975.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51501946 is about 7176.4856301675. The cubic root of 51501946 is about 372.0556291340.

The spelling of 51501946 in words is "fifty-one million, five hundred one thousand, nine hundred forty-six".