51100145 has 16 divisors (see below), whose sum is σ = 64523088. Its totient is φ = 38799360.

The previous prime is 51100057. The next prime is 51100157. The reversal of 51100145 is 54100115.

It can be written as a sum of positive squares in 8 ways, for example, as 732736 + 50367409 = 856^2 + 7097^2 .

It is not a de Polignac number, because 51100145 - 2¹⁰ = 51099121 is a prime.

It is a super-2 number, since 2×51100145² = 5222449638042050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4217 + ... + 10953.

It is an arithmetic number, because the mean of its divisors is an integer number (4032693).

Almost surely, 2^51100145 is an apocalyptic number.

It is an amenable number.

51100145 is a deficient number, since it is larger than the sum of its proper divisors (13422943).

51100145 is a wasteful number, since it uses less digits than its factorization.

51100145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 51100145 is about 7148.4365423497. The cubic root of 51100145 is about 371.0855507042.

The spelling of 51100145 in words is "fifty-one million, one hundred thousand, one hundred forty-five".