51678889 has 2 divisors, whose sum is σ = 51678890. Its totient is φ = 51678888.

The previous prime is 51678883. The next prime is 51678923. The reversal of 51678889 is 98887615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33120025 + 18558864 = 5755^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 51678889 - 2⁵ = 51678857 is a prime.

It is not a weakly prime, because it can be changed into another prime (51678883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25839444 + 25839445.

It is an arithmetic number, because the mean of its divisors is an integer number (25839445).

Almost surely, 2^51678889 is an apocalyptic number.

It is an amenable number.

51678889 is a deficient number, since it is larger than the sum of its proper divisors (1).

51678889 is an equidigital number, since it uses as much as digits as its factorization.

51678889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 52.

The square root of 51678889 is about 7188.8030297122. The cubic root of 51678889 is about 372.4812272268.

The spelling of 51678889 in words is "fifty-one million, six hundred seventy-eight thousand, eight hundred eighty-nine".