154778061 has 4 divisors (see below), whose sum is σ = 206370752. Its totient is φ = 103185372.

The previous prime is 154778059. The next prime is 154778089. The reversal of 154778061 is 160877451.

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.

It is not a de Polignac number, because 154778061 - 2¹ = 154778059 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154778051) 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, 25796341 + ... + 25796346.

It is an arithmetic number, because the mean of its divisors is an integer number (51592688).

Almost surely, 2^154778061 is an apocalyptic number.

It is an amenable number.

154778061 is a deficient number, since it is larger than the sum of its proper divisors (51592691).

154778061 is an equidigital number, since it uses as much as digits as its factorization.

154778061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51592690.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 154778061 is about 12440.9831203165. The cubic root of 154778061 is about 536.9120288395.

The spelling of 154778061 in words is "one hundred fifty-four million, seven hundred seventy-eight thousand, sixty-one".