651239401 has 2 divisors, whose sum is σ = 651239402. Its totient is φ = 651239400.

The previous prime is 651239339. The next prime is 651239437. The reversal of 651239401 is 104932156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650199001 + 1040400 = 25499^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 651239401 - 2¹⁹ = 650715113 is a prime.

It is a super-2 number, since 2×651239401² = 848225514829677602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651239441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325619700 + 325619701.

It is an arithmetic number, because the mean of its divisors is an integer number (325619701).

Almost surely, 2^651239401 is an apocalyptic number.

It is an amenable number.

651239401 is a deficient number, since it is larger than the sum of its proper divisors (1).

651239401 is an equidigital number, since it uses as much as digits as its factorization.

651239401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 651239401 is about 25519.3926455941. The cubic root of 651239401 is about 866.7893289073.

The spelling of 651239401 in words is "six hundred fifty-one million, two hundred thirty-nine thousand, four hundred one".