146991377 has 4 divisors (see below), whose sum is σ = 158298420. Its totient is φ = 135684336.

The previous prime is 146991349. The next prime is 146991389. The reversal of 146991377 is 773199641.

It is a Cunningham number, because it is equal to 12124²+1.

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 21752896 + 125238481 = 4664^2 + 11191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146991377 is a prime.

It is a super-2 number, since 2×146991377² = 43212929824712258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146991337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5653502 + ... + 5653527.

It is an arithmetic number, because the mean of its divisors is an integer number (39574605).

Almost surely, 2^146991377 is an apocalyptic number.

It is an amenable number.

146991377 is a deficient number, since it is larger than the sum of its proper divisors (11307043).

146991377 is a wasteful number, since it uses less digits than its factorization.

146991377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11307042.

The product of its digits is 285768, while the sum is 47.

The square root of 146991377 is about 12124.0000412405. Note that the first 4 decimals coincide. The cubic root of 146991377 is about 527.7528890826.

The spelling of 146991377 in words is "one hundred forty-six million, nine hundred ninety-one thousand, three hundred seventy-seven".