61245521 has 2 divisors, whose sum is σ = 61245522. Its totient is φ = 61245520.

The previous prime is 61245517. The next prime is 61245529. The reversal of 61245521 is 12554216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 21492496 = 6305^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 61245521 - 2² = 61245517 is a prime.

It is a super-2 number, since 2×61245521² = 7502027685122882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61245529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30622760 + 30622761.

It is an arithmetic number, because the mean of its divisors is an integer number (30622761).

Almost surely, 2^61245521 is an apocalyptic number.

It is an amenable number.

61245521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61245521 is an equidigital number, since it uses as much as digits as its factorization.

61245521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 61245521 is about 7825.9517632043. The cubic root of 61245521 is about 394.1771494177.

Adding to 61245521 its reverse (12554216), we get a palindrome (73799737).

The spelling of 61245521 in words is "sixty-one million, two hundred forty-five thousand, five hundred twenty-one".