51630249 has 8 divisors (see below), whose sum is σ = 75098592. Its totient is φ = 31291040.

The previous prime is 51630211. The next prime is 51630253. The reversal of 51630249 is 94203615.

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

It is not a de Polignac number, because 51630249 - 2¹⁶ = 51564713 is a prime.

It is a super-2 number, since 2×51630249² = 5331365223604002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51630259) 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, 782244 + ... + 782309.

It is an arithmetic number, because the mean of its divisors is an integer number (9387324).

Almost surely, 2^51630249 is an apocalyptic number.

It is an amenable number.

51630249 is a deficient number, since it is larger than the sum of its proper divisors (23468343).

51630249 is a wasteful number, since it uses less digits than its factorization.

51630249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564567.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 51630249 is about 7185.4191944521. The cubic root of 51630249 is about 372.3643311773.

The spelling of 51630249 in words is "fifty-one million, six hundred thirty thousand, two hundred forty-nine".