15491994841 has 2 divisors, whose sum is σ = 15491994842. Its totient is φ = 15491994840.

The previous prime is 15491994823. The next prime is 15491994877. The reversal of 15491994841 is 14849919451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15271769241 + 220225600 = 123579^2 + 14840^2 .

It is a cyclic number.

It is not a de Polignac number, because 15491994841 - 2²⁵ = 15458440409 is a prime.

It is not a weakly prime, because it can be changed into another prime (15491994541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7745997420 + 7745997421.

It is an arithmetic number, because the mean of its divisors is an integer number (7745997421).

Almost surely, 2^15491994841 is an apocalyptic number.

It is an amenable number.

15491994841 is a deficient number, since it is larger than the sum of its proper divisors (1).

15491994841 is an equidigital number, since it uses as much as digits as its factorization.

15491994841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The spelling of 15491994841 in words is "fifteen billion, four hundred ninety-one million, nine hundred ninety-four thousand, eight hundred forty-one".