154890971 has 2 divisors, whose sum is σ = 154890972. Its totient is φ = 154890970.

The previous prime is 154890959. The next prime is 154890979. The reversal of 154890971 is 179098451.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154890971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (154890979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77445485 + 77445486.

It is an arithmetic number, because the mean of its divisors is an integer number (77445486).

Almost surely, 2^154890971 is an apocalyptic number.

154890971 is a deficient number, since it is larger than the sum of its proper divisors (1).

154890971 is an equidigital number, since it uses as much as digits as its factorization.

154890971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 154890971 is about 12445.5201176970. The cubic root of 154890971 is about 537.0425555249.

The spelling of 154890971 in words is "one hundred fifty-four million, eight hundred ninety thousand, nine hundred seventy-one".