154450312981 has 4 divisors (see below), whose sum is σ = 154458752364. Its totient is φ = 154441873600.

The previous prime is 154450312963. The next prime is 154450313029. The reversal of 154450312981 is 189213054451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189213054451 = 380483 ⋅497297.

It can be written as a sum of positive squares in 2 ways, for example, as 92382563025 + 62067749956 = 303945^2 + 249134^2 .

It is a cyclic number.

It is not a de Polignac number, because 154450312981 - 2⁹ = 154450312469 is a prime.

It is a super-2 number, since 2×154450312981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154450312921) 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, 4192180 + ... + 4228861.

It is an arithmetic number, because the mean of its divisors is an integer number (38614688091).

Almost surely, 2^154450312981 is an apocalyptic number.

It is an amenable number.

154450312981 is a deficient number, since it is larger than the sum of its proper divisors (8439383).

154450312981 is an equidigital number, since it uses as much as digits as its factorization.

154450312981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8439382.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 154450312981 in words is "one hundred fifty-four billion, four hundred fifty million, three hundred twelve thousand, nine hundred eighty-one".