61518403 has 2 divisors, whose sum is σ = 61518404. Its totient is φ = 61518402.

The previous prime is 61518397. The next prime is 61518407. The reversal of 61518403 is 30481516.

61518403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61518403 - 2²¹ = 59421251 is a prime.

It is not a weakly prime, because it can be changed into another prime (61518407) 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, 30759201 + 30759202.

It is an arithmetic number, because the mean of its divisors is an integer number (30759202).

Almost surely, 2^61518403 is an apocalyptic number.

61518403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61518403 is an equidigital number, since it uses as much as digits as its factorization.

61518403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 61518403 is about 7843.3668153415. The cubic root of 61518403 is about 394.7617064032.

Adding to 61518403 its reverse (30481516), we get a palindrome (91999919).

The spelling of 61518403 in words is "sixty-one million, five hundred eighteen thousand, four hundred three".