154981809 has 16 divisors (see below), whose sum is σ = 243109440. Its totient is φ = 97243200.

The previous prime is 154981807. The next prime is 154981819. The reversal of 154981809 is 908189451.

It is not a de Polignac number, because 154981809 - 2¹ = 154981807 is a prime.

It is a super-2 number, since 2×154981809² = 48038722241824962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (154981807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168367 + ... + 169284.

It is an arithmetic number, because the mean of its divisors is an integer number (15194340).

Almost surely, 2^154981809 is an apocalyptic number.

It is an amenable number.

154981809 is a deficient number, since it is larger than the sum of its proper divisors (88127631).

154981809 is a wasteful number, since it uses less digits than its factorization.

154981809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337677 (or 337671 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 154981809 is about 12449.1690084118. The cubic root of 154981809 is about 537.1475204082.

It can be divided in two parts, 15 and 4981809, that added together give a square (4981824 = 2232²).

The spelling of 154981809 in words is "one hundred fifty-four million, nine hundred eighty-one thousand, eight hundred nine".