51155109 has 6 divisors (see below), whose sum is σ = 73890726. Its totient is φ = 34103400.

The previous prime is 51155099. The next prime is 51155119. The reversal of 51155109 is 90155115.

It is an interprime number because it is at equal distance from previous prime (51155099) and next prime (51155119).

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 12404484 = 6225^2 + 3522^2 .

It is not a de Polignac number, because 51155109 - 2⁵ = 51155077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2841942 + ... + 2841959.

It is an arithmetic number, because the mean of its divisors is an integer number (12315121).

Almost surely, 2^51155109 is an apocalyptic number.

It is an amenable number.

51155109 is a deficient number, since it is larger than the sum of its proper divisors (22735617).

51155109 is a wasteful number, since it uses less digits than its factorization.

51155109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683907 (or 5683904 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The square root of 51155109 is about 7152.2799861303. The cubic root of 51155109 is about 371.2185512251.

The spelling of 51155109 in words is "fifty-one million, one hundred fifty-five thousand, one hundred nine".