154421531 has 12 divisors (see below), whose sum is σ = 178672200. Its totient is φ = 132992640.

The previous prime is 154421483. The next prime is 154421543. The reversal of 154421531 is 135124451.

It is not a de Polignac number, because 154421531 - 2¹⁰ = 154420507 is a prime.

It is a super-2 number, since 2×154421531² = 47692018472767922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 154421531.

It is not an unprimeable number, because it can be changed into a prime (154421551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31286 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (14889350).

Almost surely, 2^154421531 is an apocalyptic number.

154421531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

154421531 is a deficient number, since it is larger than the sum of its proper divisors (24250669).

154421531 is a wasteful number, since it uses less digits than its factorization.

154421531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67210 (or 67199 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 154421531 is about 12426.6460076724. The cubic root of 154421531 is about 536.4994543981.

Adding to 154421531 its reverse (135124451), we get a palindrome (289545982).

The spelling of 154421531 in words is "one hundred fifty-four million, four hundred twenty-one thousand, five hundred thirty-one".