61133531 has 2 divisors, whose sum is σ = 61133532. Its totient is φ = 61133530.

The previous prime is 61133521. The next prime is 61133533. The reversal of 61133531 is 13533116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61133531 - 2⁶ = 61133467 is a prime.

It is a super-2 number, since 2×61133531² = 7474617225055922, which contains 22 as substring.

Together with 61133533, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 61133497 and 61133506.

It is not a weakly prime, because it can be changed into another prime (61133533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30566765 + 30566766.

It is an arithmetic number, because the mean of its divisors is an integer number (30566766).

Almost surely, 2^61133531 is an apocalyptic number.

61133531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61133531 is an equidigital number, since it uses as much as digits as its factorization.

61133531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61133531 is about 7818.7934491199. The cubic root of 61133531 is about 393.9367463540.

Adding to 61133531 its reverse (13533116), we get a palindrome (74666647).

The spelling of 61133531 in words is "sixty-one million, one hundred thirty-three thousand, five hundred thirty-one".