146899981 has 2 divisors, whose sum is σ = 146899982. Its totient is φ = 146899980.

The previous prime is 146899969. The next prime is 146899999. The reversal of 146899981 is 189998641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 34327881 = 10610^2 + 5859^2 .

It is a cyclic number.

It is not a de Polignac number, because 146899981 - 2¹⁹ = 146375693 is a prime.

It is a super-2 number, since 2×146899981² = 43159208835600722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146899901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73449990 + 73449991.

It is an arithmetic number, because the mean of its divisors is an integer number (73449991).

Almost surely, 2^146899981 is an apocalyptic number.

It is an amenable number.

146899981 is a deficient number, since it is larger than the sum of its proper divisors (1).

146899981 is an equidigital number, since it uses as much as digits as its factorization.

146899981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 55.

The square root of 146899981 is about 12120.2302370871. The cubic root of 146899981 is about 527.6434846977.

The spelling of 146899981 in words is "one hundred forty-six million, eight hundred ninety-nine thousand, nine hundred eighty-one".