61142621 has 2 divisors, whose sum is σ = 61142622. Its totient is φ = 61142620.

The previous prime is 61142617. The next prime is 61142639. The reversal of 61142621 is 12624116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54967396 + 6175225 = 7414^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 61142621 - 2² = 61142617 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61142681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30571310 + 30571311.

It is an arithmetic number, because the mean of its divisors is an integer number (30571311).

Almost surely, 2^61142621 is an apocalyptic number.

It is an amenable number.

61142621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61142621 is an equidigital number, since it uses as much as digits as its factorization.

61142621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 61142621 is about 7819.3747192471. The cubic root of 61142621 is about 393.9562703234.

Adding to 61142621 its reverse (12624116), we get a palindrome (73766737).

The spelling of 61142621 in words is "sixty-one million, one hundred forty-two thousand, six hundred twenty-one".