61503557 has 2 divisors, whose sum is σ = 61503558. Its totient is φ = 61503556.

The previous prime is 61503553. The next prime is 61503641. The reversal of 61503557 is 75530516.

61503557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44742721 + 16760836 = 6689^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 61503557 - 2² = 61503553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61503553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30751778 + 30751779.

It is an arithmetic number, because the mean of its divisors is an integer number (30751779).

Almost surely, 2^61503557 is an apocalyptic number.

It is an amenable number.

61503557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61503557 is an equidigital number, since it uses as much as digits as its factorization.

61503557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 61503557 is about 7842.4203534368. The cubic root of 61503557 is about 394.7299484061.

The spelling of 61503557 in words is "sixty-one million, five hundred three thousand, five hundred fifty-seven".