649797427 has 2 divisors, whose sum is σ = 649797428. Its totient is φ = 649797426.

The previous prime is 649797413. The next prime is 649797451. The reversal of 649797427 is 724797946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649797427 is a prime.

It is a super-2 number, since 2×649797427² = 844473392271640658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649797227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324898713 + 324898714.

It is an arithmetic number, because the mean of its divisors is an integer number (324898714).

Almost surely, 2^649797427 is an apocalyptic number.

649797427 is a deficient number, since it is larger than the sum of its proper divisors (1).

649797427 is an equidigital number, since it uses as much as digits as its factorization.

649797427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 55.

The square root of 649797427 is about 25491.1244750011. The cubic root of 649797427 is about 866.1491079632.

The spelling of 649797427 in words is "six hundred forty-nine million, seven hundred ninety-seven thousand, four hundred twenty-seven".