61031078491 has 2 divisors, whose sum is σ = 61031078492. Its totient is φ = 61031078490.

The previous prime is 61031078467. The next prime is 61031078503. The reversal of 61031078491 is 19487013016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61031078491 - 2¹¹ = 61031076443 is a prime.

It is not a weakly prime, because it can be changed into another prime (61031078411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30515539245 + 30515539246.

It is an arithmetic number, because the mean of its divisors is an integer number (30515539246).

Almost surely, 2^61031078491 is an apocalyptic number.

61031078491 is a deficient number, since it is larger than the sum of its proper divisors (1).

61031078491 is an equidigital number, since it uses as much as digits as its factorization.

61031078491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 61031078491 in words is "sixty-one billion, thirty-one million, seventy-eight thousand, four hundred ninety-one".