61377571 has 2 divisors, whose sum is σ = 61377572. Its totient is φ = 61377570.

The previous prime is 61377553. The next prime is 61377577. The reversal of 61377571 is 17577316.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61377571 - 2⁵ = 61377539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61377571.

It is not a weakly prime, because it can be changed into another prime (61377577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30688785 + 30688786.

It is an arithmetic number, because the mean of its divisors is an integer number (30688786).

Almost surely, 2^61377571 is an apocalyptic number.

61377571 is a deficient number, since it is larger than the sum of its proper divisors (1).

61377571 is an equidigital number, since it uses as much as digits as its factorization.

61377571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30870, while the sum is 37.

The square root of 61377571 is about 7834.3838940915. The cubic root of 61377571 is about 394.4602380298.

The spelling of 61377571 in words is "sixty-one million, three hundred seventy-seven thousand, five hundred seventy-one".