154856947 has 4 divisors (see below), whose sum is σ = 176979376. Its totient is φ = 132734520.

The previous prime is 154856941. The next prime is 154856987. The reversal of 154856947 is 749658451.

It is a happy number.

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 154856947 - 2¹¹ = 154854899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154856947.

It is not an unprimeable number, because it can be changed into a prime (154856941) 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, 11061204 + ... + 11061217.

It is an arithmetic number, because the mean of its divisors is an integer number (44244844).

Almost surely, 2^154856947 is an apocalyptic number.

154856947 is a deficient number, since it is larger than the sum of its proper divisors (22122429).

154856947 is an equidigital number, since it uses as much as digits as its factorization.

154856947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22122428.

The product of its digits is 1209600, while the sum is 49.

The square root of 154856947 is about 12444.1531250624. The cubic root of 154856947 is about 537.0032296389.

The spelling of 154856947 in words is "one hundred fifty-four million, eight hundred fifty-six thousand, nine hundred forty-seven".