51511245 has 8 divisors (see below), whose sum is σ = 82418016. Its totient is φ = 27472656.

The previous prime is 51511217. The next prime is 51511247. The reversal of 51511245 is 54211515.

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

It is not a de Polignac number, because 51511245 - 2⁹ = 51510733 is a prime.

It is a super-2 number, since 2×51511245² = 5306816722900050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1717027 + ... + 1717056.

It is an arithmetic number, because the mean of its divisors is an integer number (10302252).

Almost surely, 2^51511245 is an apocalyptic number.

It is an amenable number.

51511245 is a deficient number, since it is larger than the sum of its proper divisors (30906771).

51511245 is a wasteful number, since it uses less digits than its factorization.

51511245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434091.

The product of its digits is 1000, while the sum is 24.

The square root of 51511245 is about 7177.1334807150. The cubic root of 51511245 is about 372.0780201138.

The spelling of 51511245 in words is "fifty-one million, five hundred eleven thousand, two hundred forty-five".