154709491 has 4 divisors (see below), whose sum is σ = 157628592. Its totient is φ = 151790392.

The previous prime is 154709459. The next prime is 154709551. The reversal of 154709491 is 194907451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194907451 = 23 ⋅8474237.

It is a cyclic number.

It is not a de Polignac number, because 154709491 - 2⁵ = 154709459 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154709791) 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, 1459471 + ... + 1459576.

It is an arithmetic number, because the mean of its divisors is an integer number (39407148).

Almost surely, 2^154709491 is an apocalyptic number.

154709491 is a deficient number, since it is larger than the sum of its proper divisors (2919101).

154709491 is an equidigital number, since it uses as much as digits as its factorization.

154709491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919100.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 154709491 is about 12438.2270038780. The cubic root of 154709491 is about 536.8327292806.

The spelling of 154709491 in words is "one hundred fifty-four million, seven hundred nine thousand, four hundred ninety-one".