146581649 has 4 divisors (see below), whose sum is σ = 146613540. Its totient is φ = 146549760.

The previous prime is 146581621. The next prime is 146581663. The reversal of 146581649 is 946185641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946185641 = 83 ⋅11399827.

It can be written as a sum of positive squares in 2 ways, for example, as 87291649 + 59290000 = 9343^2 + 7700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146581649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146581049) 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, 7592 + ... + 18729.

It is an arithmetic number, because the mean of its divisors is an integer number (36653385).

Almost surely, 2^146581649 is an apocalyptic number.

It is an amenable number.

146581649 is a deficient number, since it is larger than the sum of its proper divisors (31891).

146581649 is an equidigital number, since it uses as much as digits as its factorization.

146581649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31890.

The product of its digits is 207360, while the sum is 44.

The square root of 146581649 is about 12107.0908561884. The cubic root of 146581649 is about 527.2620748929.

The spelling of 146581649 in words is "one hundred forty-six million, five hundred eighty-one thousand, six hundred forty-nine".