133455681 has 10 divisors (see below), whose sum is σ = 199359842. Its totient is φ = 88970400.

The previous prime is 133455671. The next prime is 133455691. The reversal of 133455681 is 186554331.

It is an interprime number because it is at equal distance from previous prime (133455671) and next prime (133455691).

It can be written as a sum of positive squares in only one way, i.e., 120560400 + 12895281 = 10980^2 + 3591^2 .

It is not a de Polignac number, because 133455681 - 2²³ = 125067073 is a prime.

It is a super-2 number, since 2×133455681² = 35620837582347522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133455631) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 823720 + ... + 823881.

Almost surely, 2^133455681 is an apocalyptic number.

It is an amenable number.

133455681 is a deficient number, since it is larger than the sum of its proper divisors (65904161).

133455681 is an equidigital number, since it uses as much as digits as its factorization.

133455681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647613 (or 1647604 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 133455681 is about 11552.3019783937. The cubic root of 133455681 is about 511.0291674432.

The spelling of 133455681 in words is "one hundred thirty-three million, four hundred fifty-five thousand, six hundred eighty-one".