649694351 has 2 divisors, whose sum is σ = 649694352. Its totient is φ = 649694350.

The previous prime is 649694293. The next prime is 649694387. The reversal of 649694351 is 153496946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649694351 - 2¹⁰ = 649693327 is a prime.

It is a super-2 number, since 2×649694351² = 844205499442622402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 649694296 and 649694305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649694051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324847175 + 324847176.

It is an arithmetic number, because the mean of its divisors is an integer number (324847176).

Almost surely, 2^649694351 is an apocalyptic number.

649694351 is a deficient number, since it is larger than the sum of its proper divisors (1).

649694351 is an equidigital number, since it uses as much as digits as its factorization.

649694351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The square root of 649694351 is about 25489.1025930691. The cubic root of 649694351 is about 866.1033070705.

The spelling of 649694351 in words is "six hundred forty-nine million, six hundred ninety-four thousand, three hundred fifty-one".