51645011 has 4 divisors (see below), whose sum is σ = 56340024. Its totient is φ = 46950000.

The previous prime is 51644987. The next prime is 51645019. The reversal of 51645011 is 11054615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51645011 - 2⁶ = 51644947 is a prime.

It is a super-2 number, since 2×51645011² = 5334414322380242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51645019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347490 + ... + 2347511.

It is an arithmetic number, because the mean of its divisors is an integer number (14085006).

Almost surely, 2^51645011 is an apocalyptic number.

51645011 is a deficient number, since it is larger than the sum of its proper divisors (4695013).

51645011 is a wasteful number, since it uses less digits than its factorization.

51645011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695012.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 51645011 is about 7186.4463401601. The cubic root of 51645011 is about 372.3998163084.

Adding to 51645011 its reverse (11054615), we get a palindrome (62699626).

The spelling of 51645011 in words is "fifty-one million, six hundred forty-five thousand, eleven".