154349621 has 4 divisors (see below), whose sum is σ = 157261932. Its totient is φ = 151437312.

The previous prime is 154349599. The next prime is 154349641. The reversal of 154349621 is 126943451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126943451 = 197 ⋅644383.

It can be written as a sum of positive squares in 2 ways, for example, as 128482225 + 25867396 = 11335^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 154349621 - 2¹⁴ = 154333237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154349641) 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, 1456076 + ... + 1456181.

It is an arithmetic number, because the mean of its divisors is an integer number (39315483).

Almost surely, 2^154349621 is an apocalyptic number.

It is an amenable number.

154349621 is a deficient number, since it is larger than the sum of its proper divisors (2912311).

154349621 is an equidigital number, since it uses as much as digits as its factorization.

154349621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912310.

The product of its digits is 25920, while the sum is 35.

The square root of 154349621 is about 12423.7522914778. The cubic root of 154349621 is about 536.4161636256.

The spelling of 154349621 in words is "one hundred fifty-four million, three hundred forty-nine thousand, six hundred twenty-one".