351640633 has 2 divisors, whose sum is σ = 351640634. Its totient is φ = 351640632.

The previous prime is 351640609. The next prime is 351640651. The reversal of 351640633 is 336046153.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347747904 + 3892729 = 18648^2 + 1973^2 .

It is an emirp because it is prime and its reverse (336046153) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351640633 is a prime.

It is a super-2 number, since 2×351640633² = 247302269553281378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 351640595 and 351640604.

It is not a weakly prime, because it can be changed into another prime (351640673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175820316 + 175820317.

It is an arithmetic number, because the mean of its divisors is an integer number (175820317).

Almost surely, 2^351640633 is an apocalyptic number.

It is an amenable number.

351640633 is a deficient number, since it is larger than the sum of its proper divisors (1).

351640633 is an equidigital number, since it uses as much as digits as its factorization.

351640633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 351640633 is about 18752.0834309151. The cubic root of 351640633 is about 705.8293029207.

Adding to 351640633 its reverse (336046153), we get a palindrome (687686786).

The spelling of 351640633 in words is "three hundred fifty-one million, six hundred forty thousand, six hundred thirty-three".