154847710921 has 2 divisors, whose sum is σ = 154847710922. Its totient is φ = 154847710920.

The previous prime is 154847710903. The next prime is 154847710973. The reversal of 154847710921 is 129017748451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111331664896 + 43516046025 = 333664^2 + 208605^2 .

It is a cyclic number.

It is not a de Polignac number, because 154847710921 - 2⁷ = 154847710793 is a prime.

It is not a weakly prime, because it can be changed into another prime (154848710921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77423855460 + 77423855461.

It is an arithmetic number, because the mean of its divisors is an integer number (77423855461).

Almost surely, 2^154847710921 is an apocalyptic number.

It is an amenable number.

154847710921 is a deficient number, since it is larger than the sum of its proper divisors (1).

154847710921 is an equidigital number, since it uses as much as digits as its factorization.

154847710921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 154847710921 in words is "one hundred fifty-four billion, eight hundred forty-seven million, seven hundred ten thousand, nine hundred twenty-one".