28951915973 has 2 divisors, whose sum is σ = 28951915974. Its totient is φ = 28951915972.

The previous prime is 28951915939. The next prime is 28951915981. The reversal of 28951915973 is 37951915982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18544447684 + 10407468289 = 136178^2 + 102017^2 .

It is a cyclic number.

It is not a de Polignac number, because 28951915973 - 2¹⁰ = 28951914949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28951915373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14475957986 + 14475957987.

It is an arithmetic number, because the mean of its divisors is an integer number (14475957987).

Almost surely, 2^28951915973 is an apocalyptic number.

It is an amenable number.

28951915973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28951915973 is an equidigital number, since it uses as much as digits as its factorization.

28951915973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6123600, while the sum is 59.

Subtracting 28951915973 from its reverse (37951915982), we obtain a palindrome (9000000009).

The spelling of 28951915973 in words is "twenty-eight billion, nine hundred fifty-one million, nine hundred fifteen thousand, nine hundred seventy-three".