51670909 has 2 divisors, whose sum is σ = 51670910. Its totient is φ = 51670908.

The previous prime is 51670891. The next prime is 51670963. The reversal of 51670909 is 90907615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49702500 + 1968409 = 7050^2 + 1403^2 .

It is a cyclic number.

It is not a de Polignac number, because 51670909 - 2⁷ = 51670781 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51676909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835454 + 25835455.

It is an arithmetic number, because the mean of its divisors is an integer number (25835455).

Almost surely, 2^51670909 is an apocalyptic number.

It is an amenable number.

51670909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51670909 is an equidigital number, since it uses as much as digits as its factorization.

51670909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 51670909 is about 7188.2479784715. The cubic root of 51670909 is about 372.4620539999.

The spelling of 51670909 in words is "fifty-one million, six hundred seventy thousand, nine hundred nine".