61220651 has 2 divisors, whose sum is σ = 61220652. Its totient is φ = 61220650.

The previous prime is 61220617. The next prime is 61220669. The reversal of 61220651 is 15602216.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61220651 is a prime.

It is not a weakly prime, because it can be changed into another prime (61220611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610325 + 30610326.

It is an arithmetic number, because the mean of its divisors is an integer number (30610326).

Almost surely, 2^61220651 is an apocalyptic number.

61220651 is a deficient number, since it is larger than the sum of its proper divisors (1).

61220651 is an equidigital number, since it uses as much as digits as its factorization.

61220651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61220651 is about 7824.3626577505. The cubic root of 61220651 is about 394.1237876220.

Adding to 61220651 its reverse (15602216), we get a palindrome (76822867).

The spelling of 61220651 in words is "sixty-one million, two hundred twenty thousand, six hundred fifty-one".