51111005 has 12 divisors (see below), whose sum is σ = 67416636. Its totient is φ = 37171200.

The previous prime is 51110999. The next prime is 51111013. The reversal of 51111005 is 50011115.

It can be written as a sum of positive squares in 2 ways, for example, as 8561476 + 42549529 = 2926^2 + 6523^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51111005 is a prime.

It is a super-2 number, since 2×51111005² = 5224669664220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41636 + ... + 42845.

It is an arithmetic number, because the mean of its divisors is an integer number (5618053).

Almost surely, 2^51111005 is an apocalyptic number.

51111005 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51111005 is a deficient number, since it is larger than the sum of its proper divisors (16305631).

51111005 is a wasteful number, since it uses less digits than its factorization.

51111005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84508 (or 84497 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 14.

The square root of 51111005 is about 7149.1961086545. The cubic root of 51111005 is about 371.1118370198. Note that the first 3 decimals are identical.

It can be divided in two parts, 5111 and 1005, that added together give a palindrome (6116).

The spelling of 51111005 in words is "fifty-one million, one hundred eleven thousand, five".