61692991 has 2 divisors, whose sum is σ = 61692992. Its totient is φ = 61692990.

The previous prime is 61692989. The next prime is 61693033. The reversal of 61692991 is 19929616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61692991 - 2¹ = 61692989 is a prime.

Together with 61692989, 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 (61692941) 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, 30846495 + 30846496.

It is an arithmetic number, because the mean of its divisors is an integer number (30846496).

Almost surely, 2^61692991 is an apocalyptic number.

61692991 is a deficient number, since it is larger than the sum of its proper divisors (1).

61692991 is an equidigital number, since it uses as much as digits as its factorization.

61692991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 43.

The square root of 61692991 is about 7854.4885893354. The cubic root of 61692991 is about 395.1347956337.

It can be divided in two parts, 616 and 92991, that multiplied together give a triangular number (57282456 = T₁₀₇₀₃).

The spelling of 61692991 in words is "sixty-one million, six hundred ninety-two thousand, nine hundred ninety-one".