154020542531 has 4 divisors (see below), whose sum is σ = 154098058632. Its totient is φ = 153943026432.

The previous prime is 154020542509. The next prime is 154020542537. The reversal of 154020542531 is 135245020451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135245020451 = 37 ⋅3655270823.

It is a cyclic number.

It is not a de Polignac number, because 154020542531 - 2¹⁴ = 154020526147 is a prime.

It is a super-2 number, since 2×154020542531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154020542537) 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, 38755070 + ... + 38759043.

It is an arithmetic number, because the mean of its divisors is an integer number (38524514658).

Almost surely, 2^154020542531 is an apocalyptic number.

154020542531 is a deficient number, since it is larger than the sum of its proper divisors (77516101).

154020542531 is an equidigital number, since it uses as much as digits as its factorization.

154020542531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77516100.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 154020542531 its reverse (135245020451), we get a palindrome (289265562982).

The spelling of 154020542531 in words is "one hundred fifty-four billion, twenty million, five hundred forty-two thousand, five hundred thirty-one".