154956421 has 2 divisors, whose sum is σ = 154956422. Its totient is φ = 154956420.

The previous prime is 154956413. The next prime is 154956427. The reversal of 154956421 is 124659451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152028900 + 2927521 = 12330^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 154956421 - 2³ = 154956413 is a prime.

It is a super-2 number, since 2×154956421² = 48022984818258482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154956427) 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, 77478210 + 77478211.

It is an arithmetic number, because the mean of its divisors is an integer number (77478211).

Almost surely, 2^154956421 is an apocalyptic number.

It is an amenable number.

154956421 is a deficient number, since it is larger than the sum of its proper divisors (1).

154956421 is an equidigital number, since it uses as much as digits as its factorization.

154956421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 154956421 is about 12448.1493001972. The cubic root of 154956421 is about 537.1181882647.

It can be divided in two parts, 1549 and 56421, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 154956421 in words is "one hundred fifty-four million, nine hundred fifty-six thousand, four hundred twenty-one".