146077781 has 4 divisors (see below), whose sum is σ = 146215500. Its totient is φ = 145940064.

The previous prime is 146077777. The next prime is 146077817. The reversal of 146077781 is 187770641.

146077781 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 112042225 + 34035556 = 10585^2 + 5834^2 .

It is a cyclic number.

It is not a de Polignac number, because 146077781 - 2² = 146077777 is a prime.

It is a super-2 number, since 2×146077781² = 42677436203767922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146077181) 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, 67256 + ... + 69393.

It is an arithmetic number, because the mean of its divisors is an integer number (36553875).

Almost surely, 2^146077781 is an apocalyptic number.

It is an amenable number.

146077781 is a deficient number, since it is larger than the sum of its proper divisors (137719).

146077781 is a wasteful number, since it uses less digits than its factorization.

146077781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137718.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 146077781 is about 12086.2641457152. The cubic root of 146077781 is about 526.6572345602.

The spelling of 146077781 in words is "one hundred forty-six million, seventy-seven thousand, seven hundred eighty-one".