15494861891 has 2 divisors, whose sum is σ = 15494861892. Its totient is φ = 15494861890.

The previous prime is 15494861783. The next prime is 15494861909. The reversal of 15494861891 is 19816849451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15494861891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15494867891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7747430945 + 7747430946.

It is an arithmetic number, because the mean of its divisors is an integer number (7747430946).

Almost surely, 2^15494861891 is an apocalyptic number.

15494861891 is a deficient number, since it is larger than the sum of its proper divisors (1).

15494861891 is an equidigital number, since it uses as much as digits as its factorization.

15494861891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 56.

The spelling of 15494861891 in words is "fifteen billion, four hundred ninety-four million, eight hundred sixty-one thousand, eight hundred ninety-one".