651763897 has 4 divisors (see below), whose sum is σ = 686067280. Its totient is φ = 617460516.

The previous prime is 651763831. The next prime is 651763961. The reversal of 651763897 is 798367156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 651763897 - 2¹⁹ = 651239609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651763817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17151663 + ... + 17151700.

It is an arithmetic number, because the mean of its divisors is an integer number (171516820).

Almost surely, 2^651763897 is an apocalyptic number.

It is an amenable number.

651763897 is a deficient number, since it is larger than the sum of its proper divisors (34303383).

651763897 is a wasteful number, since it uses less digits than its factorization.

651763897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34303382.

The product of its digits is 1905120, while the sum is 52.

The square root of 651763897 is about 25529.6669974365. Note that the first 3 decimals coincide. The cubic root of 651763897 is about 867.0219650880.

The spelling of 651763897 in words is "six hundred fifty-one million, seven hundred sixty-three thousand, eight hundred ninety-seven".