61827551 has 2 divisors, whose sum is σ = 61827552. Its totient is φ = 61827550.

The previous prime is 61827541. The next prime is 61827553. The reversal of 61827551 is 15572816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61827551 is a prime.

Together with 61827553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61827553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30913775 + 30913776.

It is an arithmetic number, because the mean of its divisors is an integer number (30913776).

Almost surely, 2^61827551 is an apocalyptic number.

61827551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61827551 is an equidigital number, since it uses as much as digits as its factorization.

61827551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 61827551 is about 7863.0497264102. The cubic root of 61827551 is about 395.4218662162.

The spelling of 61827551 in words is "sixty-one million, eight hundred twenty-seven thousand, five hundred fifty-one".