51105615 has 16 divisors (see below), whose sum is σ = 89202816. Its totient is φ = 24778400.

The previous prime is 51105599. The next prime is 51105619. The reversal of 51105615 is 51650115.

It is not a de Polignac number, because 51105615 - 2⁴ = 51105599 is a prime.

It is a super-2 number, since 2×51105615² = 5223567769056450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51105619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154701 + ... + 155030.

It is an arithmetic number, because the mean of its divisors is an integer number (5575176).

Almost surely, 2^51105615 is an apocalyptic number.

51105615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51105615 is a deficient number, since it is larger than the sum of its proper divisors (38097201).

51105615 is a wasteful number, since it uses less digits than its factorization.

51105615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309750.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51105615 is about 7148.8191332555. The cubic root of 51105615 is about 371.0987911463.

The spelling of 51105615 in words is "fifty-one million, one hundred five thousand, six hundred fifteen".