154770721 has 4 divisors (see below), whose sum is σ = 176880832. Its totient is φ = 132660612.

The previous prime is 154770677. The next prime is 154770727. The reversal of 154770721 is 127077451.

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: 127077451 = 73 ⋅1740787.

It is not a de Polignac number, because 154770721 - 2¹¹ = 154768673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154770727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11055045 + ... + 11055058.

It is an arithmetic number, because the mean of its divisors is an integer number (44220208).

Almost surely, 2^154770721 is an apocalyptic number.

It is an amenable number.

154770721 is a deficient number, since it is larger than the sum of its proper divisors (22110111).

154770721 is an equidigital number, since it uses as much as digits as its factorization.

154770721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22110110.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 154770721 is about 12440.6881240549. The cubic root of 154770721 is about 536.9035414252.

The spelling of 154770721 in words is "one hundred fifty-four million, seven hundred seventy thousand, seven hundred twenty-one".