61642571 has 2 divisors, whose sum is σ = 61642572. Its totient is φ = 61642570.

The previous prime is 61642541. The next prime is 61642577. The reversal of 61642571 is 17524616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61642571 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61642577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821285 + 30821286.

It is an arithmetic number, because the mean of its divisors is an integer number (30821286).

Almost surely, 2^61642571 is an apocalyptic number.

61642571 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642571 is an equidigital number, since it uses as much as digits as its factorization.

61642571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 61642571 is about 7851.2783035631. The cubic root of 61642571 is about 395.0271219960.

The spelling of 61642571 in words is "sixty-one million, six hundred forty-two thousand, five hundred seventy-one".