61012621 has 2 divisors, whose sum is σ = 61012622. Its totient is φ = 61012620.

The previous prime is 61012603. The next prime is 61012631. The reversal of 61012621 is 12621016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 900 = 7811^2 + 30^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61012621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61012631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30506310 + 30506311.

It is an arithmetic number, because the mean of its divisors is an integer number (30506311).

Almost surely, 2^61012621 is an apocalyptic number.

It is an amenable number.

61012621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61012621 is an equidigital number, since it uses as much as digits as its factorization.

61012621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 61012621 is about 7811.0576108489. The cubic root of 61012621 is about 393.6768653621.

Adding to 61012621 its reverse (12621016), we get a palindrome (73633637).

It can be divided in two parts, 610 and 12621, that added together give a palindrome (13231).

The spelling of 61012621 in words is "sixty-one million, twelve thousand, six hundred twenty-one".