61176991 has 2 divisors, whose sum is σ = 61176992. Its totient is φ = 61176990.

The previous prime is 61176989. The next prime is 61177001. The reversal of 61176991 is 19967116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61176991 - 2¹ = 61176989 is a prime.

It is a super-4 number, since 4×61176991⁴ (a number of 32 digits) contains 4444 as substring.

Together with 61176989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61176091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30588495 + 30588496.

It is an arithmetic number, because the mean of its divisors is an integer number (30588496).

Almost surely, 2^61176991 is an apocalyptic number.

61176991 is a deficient number, since it is larger than the sum of its proper divisors (1).

61176991 is an equidigital number, since it uses as much as digits as its factorization.

61176991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 40.

The square root of 61176991 is about 7821.5721565424. The cubic root of 61176991 is about 394.0300744906.

The spelling of 61176991 in words is "sixty-one million, one hundred seventy-six thousand, nine hundred ninety-one".