154979493 has 4 divisors (see below), whose sum is σ = 206639328. Its totient is φ = 103319660.

The previous prime is 154979491. The next prime is 154979521. The reversal of 154979493 is 394979451.

154979493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 394979451 = 3 ⋅131659817.

It is a cyclic number.

It is not a de Polignac number, because 154979493 - 2¹ = 154979491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154979491) 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, 25829913 + ... + 25829918.

It is an arithmetic number, because the mean of its divisors is an integer number (51659832).

Almost surely, 2^154979493 is an apocalyptic number.

It is an amenable number.

154979493 is a deficient number, since it is larger than the sum of its proper divisors (51659835).

154979493 is an equidigital number, since it uses as much as digits as its factorization.

154979493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51659834.

The product of its digits is 1224720, while the sum is 51.

The square root of 154979493 is about 12449.0759898074. The cubic root of 154979493 is about 537.1448447396.

The spelling of 154979493 in words is "one hundred fifty-four million, nine hundred seventy-nine thousand, four hundred ninety-three".