154642657 has 4 divisors (see below), whose sum is σ = 166538260. Its totient is φ = 142747056.

The previous prime is 154642637. The next prime is 154642661. The reversal of 154642657 is 756246451.

It is a happy number.

154642657 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.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 134652816 = 4471^2 + 11604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154642657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154642637) 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, 5947782 + ... + 5947807.

It is an arithmetic number, because the mean of its divisors is an integer number (41634565).

Almost surely, 2^154642657 is an apocalyptic number.

It is an amenable number.

154642657 is a deficient number, since it is larger than the sum of its proper divisors (11895603).

154642657 is a wasteful number, since it uses less digits than its factorization.

154642657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11895602.

The product of its digits is 201600, while the sum is 40.

The square root of 154642657 is about 12435.5400767317. The cubic root of 154642657 is about 536.7554148117.

The spelling of 154642657 in words is "one hundred fifty-four million, six hundred forty-two thousand, six hundred fifty-seven".