51289885 has 16 divisors (see below), whose sum is σ = 64416384. Its totient is φ = 39130432.

The previous prime is 51289879. The next prime is 51289891. The reversal of 51289885 is 58898215.

51289885 = T₅₈₄₆ + T₅₈₄₇ + T₅₈₄₈.

It is an interprime number because it is at equal distance from previous prime (51289879) and next prime (51289891).

It is a cyclic number.

It is not a de Polignac number, because 51289885 - 2⁷ = 51289757 is a prime.

It is a Duffinian number.

It is a congruent 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, 74754 + ... + 75436.

It is an arithmetic number, because the mean of its divisors is an integer number (4026024).

Almost surely, 2^51289885 is an apocalyptic number.

51289885 is the 5848-th centered triangular number.

It is an amenable number.

51289885 is a deficient number, since it is larger than the sum of its proper divisors (13126499).

51289885 is a wasteful number, since it uses less digits than its factorization.

51289885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364.

The product of its digits is 230400, while the sum is 46.

The square root of 51289885 is about 7161.6956790972. The cubic root of 51289885 is about 371.5442761182.

The spelling of 51289885 in words is "fifty-one million, two hundred eighty-nine thousand, eight hundred eighty-five".