154231691 has 2 divisors, whose sum is σ = 154231692. Its totient is φ = 154231690.

The previous prime is 154231687. The next prime is 154231739. The reversal of 154231691 is 196132451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154231691 - 2² = 154231687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (124231691) 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, 77115845 + 77115846.

It is an arithmetic number, because the mean of its divisors is an integer number (77115846).

Almost surely, 2^154231691 is an apocalyptic number.

154231691 is a deficient number, since it is larger than the sum of its proper divisors (1).

154231691 is an equidigital number, since it uses as much as digits as its factorization.

154231691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 154231691 is about 12419.0052339147. The cubic root of 154231691 is about 536.2795135199.

It can be divided in two parts, 1542 and 31691, that added together give a palindrome (33233).

The spelling of 154231691 in words is "one hundred fifty-four million, two hundred thirty-one thousand, six hundred ninety-one".