15445121947 has 2 divisors, whose sum is σ = 15445121948. Its totient is φ = 15445121946.

The previous prime is 15445121929. The next prime is 15445122001. The reversal of 15445121947 is 74912154451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15445121947 - 2⁷ = 15445121819 is a prime.

It is not a weakly prime, because it can be changed into another prime (15445121047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7722560973 + 7722560974.

It is an arithmetic number, because the mean of its divisors is an integer number (7722560974).

Almost surely, 2^15445121947 is an apocalyptic number.

15445121947 is a deficient number, since it is larger than the sum of its proper divisors (1).

15445121947 is an equidigital number, since it uses as much as digits as its factorization.

15445121947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The spelling of 15445121947 in words is "fifteen billion, four hundred forty-five million, one hundred twenty-one thousand, nine hundred forty-seven".