133262981 has 4 divisors (see below), whose sum is σ = 133781772. Its totient is φ = 132744192.

The previous prime is 133262971. The next prime is 133263007. The reversal of 133262981 is 189262331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189262331 = 23 ⋅8228797.

It can be written as a sum of positive squares in 2 ways, for example, as 120802081 + 12460900 = 10991^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 133262981 - 2²² = 129068677 is a prime.

It is a super-2 number, since 2×133262981² = 35518044210012722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133262911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259010 + ... + 259523.

It is an arithmetic number, because the mean of its divisors is an integer number (33445443).

Almost surely, 2^133262981 is an apocalyptic number.

It is an amenable number.

133262981 is a deficient number, since it is larger than the sum of its proper divisors (518791).

133262981 is an equidigital number, since it uses as much as digits as its factorization.

133262981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518790.

The product of its digits is 15552, while the sum is 35.

The square root of 133262981 is about 11543.9586364470. The cubic root of 133262981 is about 510.7830863600.

The spelling of 133262981 in words is "one hundred thirty-three million, two hundred sixty-two thousand, nine hundred eighty-one".