154942749 has 18 divisors (see below), whose sum is σ = 242348730. Its totient is φ = 95348448.

The previous prime is 154942727. The next prime is 154942751. The reversal of 154942749 is 947249451.

It can be written as a sum of positive squares in 3 ways, for example, as 2913849 + 152028900 = 1707^2 + 12330^2 .

It is not a de Polignac number, because 154942749 - 2¹¹ = 154940701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154942349) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 49414 + ... + 52455.

Almost surely, 2^154942749 is an apocalyptic number.

It is an amenable number.

154942749 is a deficient number, since it is larger than the sum of its proper divisors (87405981).

154942749 is a wasteful number, since it uses less digits than its factorization.

154942749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101901 (or 101885 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 154942749 is about 12447.6001301456. The cubic root of 154942749 is about 537.1023909289.

The spelling of 154942749 in words is "one hundred fifty-four million, nine hundred forty-two thousand, seven hundred forty-nine".