51020489 has 16 divisors (see below), whose sum is σ = 56814912. Its totient is φ = 45517248.

The previous prime is 51020471. The next prime is 51020507. The reversal of 51020489 is 98402015.

It is an interprime number because it is at equal distance from previous prime (51020471) and next prime (51020507).

It is a cyclic number.

It is not a de Polignac number, because 51020489 - 2²⁰ = 49971913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51020419) 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, 59387 + ... + 60239.

It is an arithmetic number, because the mean of its divisors is an integer number (3550932).

Almost surely, 2^51020489 is an apocalyptic number.

It is an amenable number.

51020489 is a deficient number, since it is larger than the sum of its proper divisors (5794423).

51020489 is a wasteful number, since it uses less digits than its factorization.

51020489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 51020489 is about 7142.8628014263. The cubic root of 51020489 is about 370.8926317271.

The spelling of 51020489 in words is "fifty-one million, twenty thousand, four hundred eighty-nine".