651701641 has 4 divisors (see below), whose sum is σ = 659553552. Its totient is φ = 643849732.

The previous prime is 651701629. The next prime is 651701689. The reversal of 651701641 is 146107156.

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 651701641 - 2⁷ = 651701513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651701041) 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, 3925831 + ... + 3925996.

It is an arithmetic number, because the mean of its divisors is an integer number (164888388).

Almost surely, 2^651701641 is an apocalyptic number.

It is an amenable number.

651701641 is a deficient number, since it is larger than the sum of its proper divisors (7851911).

651701641 is an equidigital number, since it uses as much as digits as its factorization.

651701641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851910.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 651701641 is about 25528.4476809696. The cubic root of 651701641 is about 866.9943584458.

Adding to 651701641 its reverse (146107156), we get a palindrome (797808797).

The spelling of 651701641 in words is "six hundred fifty-one million, seven hundred one thousand, six hundred forty-one".