61135531 has 2 divisors, whose sum is σ = 61135532. Its totient is φ = 61135530.

The previous prime is 61135517. The next prime is 61135549. The reversal of 61135531 is 13553116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61135531 - 2¹¹ = 61133483 is a prime.

It is a super-2 number, since 2×61135531² = 7475106301303922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61135496 and 61135505.

It is not a weakly prime, because it can be changed into another prime (61135561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30567765 + 30567766.

It is an arithmetic number, because the mean of its divisors is an integer number (30567766).

Almost surely, 2^61135531 is an apocalyptic number.

61135531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61135531 is an equidigital number, since it uses as much as digits as its factorization.

61135531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 25.

The square root of 61135531 is about 7818.9213450450. The cubic root of 61135531 is about 393.9410422229.

Adding to 61135531 its reverse (13553116), we get a palindrome (74688647).

It can be divided in two parts, 6 and 1135531, that multiplied together give a palindrome (6813186).

The spelling of 61135531 in words is "sixty-one million, one hundred thirty-five thousand, five hundred thirty-one".