651898897 has 4 divisors (see below), whose sum is σ = 702044980. Its totient is φ = 601752816.

The previous prime is 651898829. The next prime is 651898903. The reversal of 651898897 is 798898156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 406788561 + 245110336 = 20169^2 + 15656^2 .

It is a cyclic number.

It is not a de Polignac number, because 651898897 - 2⁷ = 651898769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651898997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25073022 + ... + 25073047.

It is an arithmetic number, because the mean of its divisors is an integer number (175511245).

Almost surely, 2^651898897 is an apocalyptic number.

It is an amenable number.

651898897 is a deficient number, since it is larger than the sum of its proper divisors (50146083).

651898897 is a wasteful number, since it uses less digits than its factorization.

651898897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50146082.

The product of its digits is 8709120, while the sum is 61.

The square root of 651898897 is about 25532.3108433216. The cubic root of 651898897 is about 867.0818231058.

The spelling of 651898897 in words is "six hundred fifty-one million, eight hundred ninety-eight thousand, eight hundred ninety-seven".