653631403 has 2 divisors, whose sum is σ = 653631404. Its totient is φ = 653631402.

The previous prime is 653631401. The next prime is 653631421. The reversal of 653631403 is 304136356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 653631403 - 2¹ = 653631401 is a prime.

Together with 653631401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (653631401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326815701 + 326815702.

It is an arithmetic number, because the mean of its divisors is an integer number (326815702).

Almost surely, 2^653631403 is an apocalyptic number.

653631403 is a deficient number, since it is larger than the sum of its proper divisors (1).

653631403 is an equidigital number, since it uses as much as digits as its factorization.

653631403 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 653631403 is about 25566.2160477455. The cubic root of 653631403 is about 867.8492711685.

Adding to 653631403 its reverse (304136356), we get a palindrome (957767759).

It can be divided in two parts, 65363 and 1403, that added together give a palindrome (66766).

The spelling of 653631403 in words is "six hundred fifty-three million, six hundred thirty-one thousand, four hundred three".