146991869 has 4 divisors (see below), whose sum is σ = 148292796. Its totient is φ = 145690944.

The previous prime is 146991857. The next prime is 146991893. The reversal of 146991869 is 968199641.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968199641 = 419 ⋅2310739.

It can be written as a sum of positive squares in 2 ways, for example, as 9211225 + 137780644 = 3035^2 + 11738^2 .

It is a cyclic number.

It is not a de Polignac number, because 146991869 - 2⁴ = 146991853 is a prime.

It is a super-2 number, since 2×146991869² = 43213219104226322, which contains 22 as substring.

It is a Duffinian number.

146991869 is a modest number, since divided by 91869 gives 1469 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 146991869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146991829) 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, 650294 + ... + 650519.

It is an arithmetic number, because the mean of its divisors is an integer number (37073199).

Almost surely, 2^146991869 is an apocalyptic number.

It is an amenable number.

146991869 is a deficient number, since it is larger than the sum of its proper divisors (1300927).

146991869 is a wasteful number, since it uses less digits than its factorization.

146991869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300926.

The product of its digits is 839808, while the sum is 53.

The square root of 146991869 is about 12124.0203315567. The cubic root of 146991869 is about 527.7534779020.

The spelling of 146991869 in words is "one hundred forty-six million, nine hundred ninety-one thousand, eight hundred sixty-nine".