61642541 has 2 divisors, whose sum is σ = 61642542. Its totient is φ = 61642540.

The previous prime is 61642501. The next prime is 61642571. The reversal of 61642541 is 14524616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 958441 = 7790^2 + 979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61642541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61642501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821270 + 30821271.

It is an arithmetic number, because the mean of its divisors is an integer number (30821271).

Almost surely, 2^61642541 is an apocalyptic number.

It is an amenable number.

61642541 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642541 is an equidigital number, since it uses as much as digits as its factorization.

61642541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 61642541 is about 7851.2763930459. The cubic root of 61642541 is about 395.0270579125.

The spelling of 61642541 in words is "sixty-one million, six hundred forty-two thousand, five hundred forty-one".