133263631 has 2 divisors, whose sum is σ = 133263632. Its totient is φ = 133263630.

The previous prime is 133263623. The next prime is 133263643. The reversal of 133263631 is 136362331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133263631 - 2³ = 133263623 is a prime.

It is a super-2 number, since 2×133263631² = 35518390694608322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133263631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133263661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66631815 + 66631816.

It is an arithmetic number, because the mean of its divisors is an integer number (66631816).

Almost surely, 2^133263631 is an apocalyptic number.

133263631 is a deficient number, since it is larger than the sum of its proper divisors (1).

133263631 is an equidigital number, since it uses as much as digits as its factorization.

133263631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 28.

The square root of 133263631 is about 11543.9867896667. The cubic root of 133263631 is about 510.7839168193.

The spelling of 133263631 in words is "one hundred thirty-three million, two hundred sixty-three thousand, six hundred thirty-one".