61605787 has 2 divisors, whose sum is σ = 61605788. Its totient is φ = 61605786.

The previous prime is 61605779. The next prime is 61605827. The reversal of 61605787 is 78750616.

It is an a-pointer prime, because the next prime (61605827) can be obtained adding 61605787 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61605787 - 2³ = 61605779 is a prime.

It is not a weakly prime, because it can be changed into another prime (61605737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802893 + 30802894.

It is an arithmetic number, because the mean of its divisors is an integer number (30802894).

Almost surely, 2^61605787 is an apocalyptic number.

61605787 is a deficient number, since it is larger than the sum of its proper divisors (1).

61605787 is an equidigital number, since it uses as much as digits as its factorization.

61605787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 61605787 is about 7848.9354055184. The cubic root of 61605787 is about 394.9485314556.

The spelling of 61605787 in words is "sixty-one million, six hundred five thousand, seven hundred eighty-seven".