133561031 has 2 divisors, whose sum is σ = 133561032. Its totient is φ = 133561030.

The previous prime is 133560997. The next prime is 133561033. The reversal of 133561031 is 130165331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133561031 is a prime.

It is a super-2 number, since 2×133561031² = 35677098003565922, which contains 22 as substring.

Together with 133561033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133560988 and 133561006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133561033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66780515 + 66780516.

It is an arithmetic number, because the mean of its divisors is an integer number (66780516).

Almost surely, 2^133561031 is an apocalyptic number.

133561031 is a deficient number, since it is larger than the sum of its proper divisors (1).

133561031 is an equidigital number, since it uses as much as digits as its factorization.

133561031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 133561031 is about 11556.8607761797. The cubic root of 133561031 is about 511.1636009927.

The spelling of 133561031 in words is "one hundred thirty-three million, five hundred sixty-one thousand, thirty-one".