61062721 has 2 divisors, whose sum is σ = 61062722. Its totient is φ = 61062720.

The previous prime is 61062707. The next prime is 61062779. The reversal of 61062721 is 12726016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 30371121 = 5540^2 + 5511^2 .

It is a cyclic number.

It is not a de Polignac number, because 61062721 - 2⁵ = 61062689 is a prime.

It is not a weakly prime, because it can be changed into another prime (61062791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30531360 + 30531361.

It is an arithmetic number, because the mean of its divisors is an integer number (30531361).

Almost surely, 2^61062721 is an apocalyptic number.

It is an amenable number.

61062721 is a deficient number, since it is larger than the sum of its proper divisors (1).

61062721 is an equidigital number, since it uses as much as digits as its factorization.

61062721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 61062721 is about 7814.2639448639. The cubic root of 61062721 is about 393.7845906959.

Adding to 61062721 its reverse (12726016), we get a palindrome (73788737).

The spelling of 61062721 in words is "sixty-one million, sixty-two thousand, seven hundred twenty-one".