633748721 has 2 divisors, whose sum is σ = 633748722. Its totient is φ = 633748720.

The previous prime is 633748699. The next prime is 633748789. The reversal of 633748721 is 127847336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522762496 + 110986225 = 22864^2 + 10535^2 .

It is a cyclic number.

It is not a de Polignac number, because 633748721 - 2¹⁸ = 633486577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (633744721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316874360 + 316874361.

It is an arithmetic number, because the mean of its divisors is an integer number (316874361).

Almost surely, 2^633748721 is an apocalyptic number.

It is an amenable number.

633748721 is a deficient number, since it is larger than the sum of its proper divisors (1).

633748721 is an equidigital number, since it uses as much as digits as its factorization.

633748721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 41.

The square root of 633748721 is about 25174.3663475369. The cubic root of 633748721 is about 858.9588631225.

The spelling of 633748721 in words is "six hundred thirty-three million, seven hundred forty-eight thousand, seven hundred twenty-one".