651698401 has 2 divisors, whose sum is σ = 651698402. Its totient is φ = 651698400.

The previous prime is 651698387. The next prime is 651698431. The reversal of 651698401 is 104896156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636300625 + 15397776 = 25225^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 651698401 - 2⁷ = 651698273 is a prime.

It is not a weakly prime, because it can be changed into another prime (651698431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325849200 + 325849201.

It is an arithmetic number, because the mean of its divisors is an integer number (325849201).

Almost surely, 2^651698401 is an apocalyptic number.

It is an amenable number.

651698401 is a deficient number, since it is larger than the sum of its proper divisors (1).

651698401 is an equidigital number, since it uses as much as digits as its factorization.

651698401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 651698401 is about 25528.3842222731. The cubic root of 651698401 is about 866.9929216603.

The spelling of 651698401 in words is "six hundred fifty-one million, six hundred ninety-eight thousand, four hundred one".