61603987 has 2 divisors, whose sum is σ = 61603988. Its totient is φ = 61603986.

The previous prime is 61603957. The next prime is 61604003. The reversal of 61603987 is 78930616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61603987 is a prime.

It is not a weakly prime, because it can be changed into another prime (61603957) 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, 30801993 + 30801994.

It is an arithmetic number, because the mean of its divisors is an integer number (30801994).

Almost surely, 2^61603987 is an apocalyptic number.

61603987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61603987 is an equidigital number, since it uses as much as digits as its factorization.

61603987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 61603987 is about 7848.8207394487. The cubic root of 61603987 is about 394.9446848782.

The spelling of 61603987 in words is "sixty-one million, six hundred three thousand, nine hundred eighty-seven".