61311787 has 2 divisors, whose sum is σ = 61311788. Its totient is φ = 61311786.

The previous prime is 61311781. The next prime is 61311791. The reversal of 61311787 is 78711316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61311787 - 2³ = 61311779 is a prime.

It is not a weakly prime, because it can be changed into another prime (61311781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655893 + 30655894.

It is an arithmetic number, because the mean of its divisors is an integer number (30655894).

Almost surely, 2^61311787 is an apocalyptic number.

61311787 is a deficient number, since it is larger than the sum of its proper divisors (1).

61311787 is an equidigital number, since it uses as much as digits as its factorization.

61311787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 61311787 is about 7830.1843528745. The cubic root of 61311787 is about 394.3192611871.

The spelling of 61311787 in words is "sixty-one million, three hundred eleven thousand, seven hundred eighty-seven".