154343398621 has 2 divisors, whose sum is σ = 154343398622. Its totient is φ = 154343398620.

The previous prime is 154343398607. The next prime is 154343398631. The reversal of 154343398621 is 126893343451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81381825625 + 72961572996 = 285275^2 + 270114^2 .

It is a cyclic number.

It is not a de Polignac number, because 154343398621 - 2²⁵ = 154309844189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154343398631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77171699310 + 77171699311.

It is an arithmetic number, because the mean of its divisors is an integer number (77171699311).

Almost surely, 2^154343398621 is an apocalyptic number.

It is an amenable number.

154343398621 is a deficient number, since it is larger than the sum of its proper divisors (1).

154343398621 is an equidigital number, since it uses as much as digits as its factorization.

154343398621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 49.

The spelling of 154343398621 in words is "one hundred fifty-four billion, three hundred forty-three million, three hundred ninety-eight thousand, six hundred twenty-one".