146149781 has 2 divisors, whose sum is σ = 146149782. Its totient is φ = 146149780.

The previous prime is 146149777. The next prime is 146149831. The reversal of 146149781 is 187941641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117527281 + 28622500 = 10841^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 146149781 - 2² = 146149777 is a prime.

It is a super-2 number, since 2×146149781² = 42719516972695922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146149771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73074890 + 73074891.

It is an arithmetic number, because the mean of its divisors is an integer number (73074891).

Almost surely, 2^146149781 is an apocalyptic number.

It is an amenable number.

146149781 is a deficient number, since it is larger than the sum of its proper divisors (1).

146149781 is an equidigital number, since it uses as much as digits as its factorization.

146149781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 146149781 is about 12089.2423666663. The cubic root of 146149781 is about 526.7437480426.

The spelling of 146149781 in words is "one hundred forty-six million, one hundred forty-nine thousand, seven hundred eighty-one".