154216691 has 2 divisors, whose sum is σ = 154216692. Its totient is φ = 154216690.

The previous prime is 154216687. The next prime is 154216789. The reversal of 154216691 is 196612451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154216691 - 2² = 154216687 is a prime.

It is equal to p_8668016 and since 154216691 and 8668016 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (154216091) 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, 77108345 + 77108346.

It is an arithmetic number, because the mean of its divisors is an integer number (77108346).

Almost surely, 2^154216691 is an apocalyptic number.

154216691 is a deficient number, since it is larger than the sum of its proper divisors (1).

154216691 is an equidigital number, since it uses as much as digits as its factorization.

154216691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 154216691 is about 12418.4013061263. The cubic root of 154216691 is about 536.2621274400.

The spelling of 154216691 in words is "one hundred fifty-four million, two hundred sixteen thousand, six hundred ninety-one".