154856971 has 4 divisors (see below), whose sum is σ = 155752272. Its totient is φ = 153961672.

The previous prime is 154856941. The next prime is 154856987. The reversal of 154856971 is 179658451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 154856971 - 2¹⁹ = 154332683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154856921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447391 + ... + 447736.

It is an arithmetic number, because the mean of its divisors is an integer number (38938068).

Almost surely, 2^154856971 is an apocalyptic number.

154856971 is a deficient number, since it is larger than the sum of its proper divisors (895301).

154856971 is an equidigital number, since it uses as much as digits as its factorization.

154856971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895300.

The product of its digits is 302400, while the sum is 46.

The square root of 154856971 is about 12444.1540893706. The cubic root of 154856971 is about 537.0032573808.

Subtracting from 154856971 its product of digits (302400), we obtain a triangular number (154554571 = T₁₇₅₈₁).

The spelling of 154856971 in words is "one hundred fifty-four million, eight hundred fifty-six thousand, nine hundred seventy-one".