61009191499 has 2 divisors, whose sum is σ = 61009191500. Its totient is φ = 61009191498.

The previous prime is 61009191461. The next prime is 61009191517. The reversal of 61009191499 is 99419190016.

It is a happy number.

61009191499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61009191499 - 2¹⁹ = 61008667211 is a prime.

It is not a weakly prime, because it can be changed into another prime (61009191599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30504595749 + 30504595750.

It is an arithmetic number, because the mean of its divisors is an integer number (30504595750).

Almost surely, 2^61009191499 is an apocalyptic number.

61009191499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61009191499 is an equidigital number, since it uses as much as digits as its factorization.

61009191499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 49.

The spelling of 61009191499 in words is "sixty-one billion, nine million, one hundred ninety-one thousand, four hundred ninety-nine".