61605403 has 2 divisors, whose sum is σ = 61605404. Its totient is φ = 61605402.

The previous prime is 61605373. The next prime is 61605409. The reversal of 61605403 is 30450616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61605403 - 2⁵ = 61605371 is a prime.

It is not a weakly prime, because it can be changed into another prime (61605409) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802701 + 30802702.

It is an arithmetic number, because the mean of its divisors is an integer number (30802702).

Almost surely, 2^61605403 is an apocalyptic number.

61605403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61605403 is an equidigital number, since it uses as much as digits as its factorization.

61605403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 61605403 is about 7848.9109435641. The cubic root of 61605403 is about 394.9477108587.

The spelling of 61605403 in words is "sixty-one million, six hundred five thousand, four hundred three".