51899389 has 2 divisors, whose sum is σ = 51899390. Its totient is φ = 51899388.

The previous prime is 51899381. The next prime is 51899401. The reversal of 51899389 is 98399815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37724164 + 14175225 = 6142^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 51899389 - 2³ = 51899381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51899381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25949694 + 25949695.

It is an arithmetic number, because the mean of its divisors is an integer number (25949695).

Almost surely, 2^51899389 is an apocalyptic number.

It is an amenable number.

51899389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51899389 is an equidigital number, since it uses as much as digits as its factorization.

51899389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 52.

The square root of 51899389 is about 7204.1230555842. The cubic root of 51899389 is about 373.0102348247.

The spelling of 51899389 in words is "fifty-one million, eight hundred ninety-nine thousand, three hundred eighty-nine".