61442621 has 2 divisors, whose sum is σ = 61442622. Its totient is φ = 61442620.

The previous prime is 61442609. The next prime is 61442627. The reversal of 61442621 is 12624416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39866596 + 21576025 = 6314^2 + 4645^2 .

It is a cyclic number.

It is not a de Polignac number, because 61442621 - 2¹⁴ = 61426237 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 (61442627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30721310 + 30721311.

It is an arithmetic number, because the mean of its divisors is an integer number (30721311).

Almost surely, 2^61442621 is an apocalyptic number.

It is an amenable number.

61442621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61442621 is an equidigital number, since it uses as much as digits as its factorization.

61442621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 61442621 is about 7838.5343655558. The cubic root of 61442621 is about 394.5995428737.

The spelling of 61442621 in words is "sixty-one million, four hundred forty-two thousand, six hundred twenty-one".