154591139449 has 4 divisors (see below), whose sum is σ = 154686626640. Its totient is φ = 154495652260.

The previous prime is 154591139431. The next prime is 154591139471. The reversal of 154591139449 is 944931195451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944931195451 = 9377 ⋅100771163.

It is a cyclic number.

It is not a de Polignac number, because 154591139449 - 2³⁷ = 17152185977 is a prime.

It is a super-2 number, since 2×154591139449² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154591139449.

It is not an unprimeable number, because it can be changed into a prime (154591139489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47741167 + ... + 47744404.

It is an arithmetic number, because the mean of its divisors is an integer number (38671656660).

Almost surely, 2^154591139449 is an apocalyptic number.

It is an amenable number.

154591139449 is a deficient number, since it is larger than the sum of its proper divisors (95487191).

154591139449 is an equidigital number, since it uses as much as digits as its factorization.

154591139449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95487190.

The product of its digits is 3499200, while the sum is 55.

The spelling of 154591139449 in words is "one hundred fifty-four billion, five hundred ninety-one million, one hundred thirty-nine thousand, four hundred forty-nine".