154186421 has 2 divisors, whose sum is σ = 154186422. Its totient is φ = 154186420.

The previous prime is 154186399. The next prime is 154186441. The reversal of 154186421 is 124681451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82174225 + 72012196 = 9065^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 154186421 - 2¹⁰ = 154185397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154186441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77093210 + 77093211.

It is an arithmetic number, because the mean of its divisors is an integer number (77093211).

Almost surely, 2^154186421 is an apocalyptic number.

It is an amenable number.

154186421 is a deficient number, since it is larger than the sum of its proper divisors (1).

154186421 is an equidigital number, since it uses as much as digits as its factorization.

154186421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 154186421 is about 12417.1824904042. The cubic root of 154186421 is about 536.2270388975.

The spelling of 154186421 in words is "one hundred fifty-four million, one hundred eighty-six thousand, four hundred twenty-one".