133941961 has 4 divisors (see below), whose sum is σ = 137562052. Its totient is φ = 130321872.

The previous prime is 133941953. The next prime is 133942007. The reversal of 133941961 is 169149331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169149331 = 13 ⋅13011487.

It can be written as a sum of positive squares in 2 ways, for example, as 70644025 + 63297936 = 8405^2 + 7956^2 .

It is a cyclic number.

It is not a de Polignac number, because 133941961 - 2³ = 133941953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3620053 = 133941961 / (1 + 3 + 3 + 9 + 4 + 1 + 9 + 6 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133941961.

It is not an unprimeable number, because it can be changed into a prime (133941061) 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, 1809990 + ... + 1810063.

It is an arithmetic number, because the mean of its divisors is an integer number (34390513).

Almost surely, 2^133941961 is an apocalyptic number.

It is an amenable number.

133941961 is a deficient number, since it is larger than the sum of its proper divisors (3620091).

133941961 is an equidigital number, since it uses as much as digits as its factorization.

133941961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620090.

The product of its digits is 17496, while the sum is 37.

The square root of 133941961 is about 11573.3297283020. The cubic root of 133941961 is about 511.6491036965.

The spelling of 133941961 in words is "one hundred thirty-three million, nine hundred forty-one thousand, nine hundred sixty-one".