51281963 has 8 divisors (see below), whose sum is σ = 52763760. Its totient is φ = 49805280.

The previous prime is 51281959. The next prime is 51281983. The reversal of 51281963 is 36918215.

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 51281963 - 2² = 51281959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51281933) 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, 29153 + ... + 30861.

It is an arithmetic number, because the mean of its divisors is an integer number (6595470).

Almost surely, 2^51281963 is an apocalyptic number.

51281963 is a deficient number, since it is larger than the sum of its proper divisors (1481797).

51281963 is a wasteful number, since it uses less digits than its factorization.

51281963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its digits is 12960, while the sum is 35.

The square root of 51281963 is about 7161.1425764329. The cubic root of 51281963 is about 371.5251461259.

The spelling of 51281963 in words is "fifty-one million, two hundred eighty-one thousand, nine hundred sixty-three".