51698407 has 2 divisors, whose sum is σ = 51698408. Its totient is φ = 51698406.

The previous prime is 51698401. The next prime is 51698419. The reversal of 51698407 is 70489615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51698407 - 2⁷ = 51698279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51698407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51698401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25849203 + 25849204.

It is an arithmetic number, because the mean of its divisors is an integer number (25849204).

Almost surely, 2^51698407 is an apocalyptic number.

51698407 is a deficient number, since it is larger than the sum of its proper divisors (1).

51698407 is an equidigital number, since it uses as much as digits as its factorization.

51698407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 51698407 is about 7190.1604293646. The cubic root of 51698407 is about 372.5281140290.

The spelling of 51698407 in words is "fifty-one million, six hundred ninety-eight thousand, four hundred seven".