61543403 has 2 divisors, whose sum is σ = 61543404. Its totient is φ = 61543402.

The previous prime is 61543387. The next prime is 61543429. The reversal of 61543403 is 30434516.

It is an a-pointer prime, because the next prime (61543429) can be obtained adding 61543403 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61543403 - 2⁴ = 61543387 is a prime.

It is not a weakly prime, because it can be changed into another prime (61543103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30771701 + 30771702.

It is an arithmetic number, because the mean of its divisors is an integer number (30771702).

Almost surely, 2^61543403 is an apocalyptic number.

61543403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61543403 is an equidigital number, since it uses as much as digits as its factorization.

61543403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 61543403 is about 7844.9603568151. The cubic root of 61543403 is about 394.8151739057.

Adding to 61543403 its reverse (30434516), we get a palindrome (91977919).

The spelling of 61543403 in words is "sixty-one million, five hundred forty-three thousand, four hundred three".