154885421 has 2 divisors, whose sum is σ = 154885422. Its totient is φ = 154885420.

The previous prime is 154885417. The next prime is 154885439. The reversal of 154885421 is 124588451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154878025 + 7396 = 12445^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 154885421 - 2² = 154885417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154884421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77442710 + 77442711.

It is an arithmetic number, because the mean of its divisors is an integer number (77442711).

Almost surely, 2^154885421 is an apocalyptic number.

It is an amenable number.

154885421 is a deficient number, since it is larger than the sum of its proper divisors (1).

154885421 is an equidigital number, since it uses as much as digits as its factorization.

154885421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51200, while the sum is 38.

The square root of 154885421 is about 12445.2971439014. The cubic root of 154885421 is about 537.0361410735.

The spelling of 154885421 in words is "one hundred fifty-four million, eight hundred eighty-five thousand, four hundred twenty-one".