51020109 has 12 divisors (see below), whose sum is σ = 84223776. Its totient is φ = 29154312.

The previous prime is 51020107. The next prime is 51020117. The reversal of 51020109 is 90102015.

It is not a de Polignac number, because 51020109 - 2¹ = 51020107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51020091 and 51020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404859 + ... + 404984.

It is an arithmetic number, because the mean of its divisors is an integer number (7018648).

Almost surely, 2^51020109 is an apocalyptic number.

It is an amenable number.

51020109 is a deficient number, since it is larger than the sum of its proper divisors (33203667).

51020109 is a wasteful number, since it uses less digits than its factorization.

51020109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809856 (or 809853 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51020109 is about 7142.8362013979. The cubic root of 51020109 is about 370.8917109235.

The spelling of 51020109 in words is "fifty-one million, twenty thousand, one hundred nine".