146621381 has 2 divisors, whose sum is σ = 146621382. Its totient is φ = 146621380.

The previous prime is 146621353. The next prime is 146621401. The reversal of 146621381 is 183126641.

146621381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120253156 + 26368225 = 10966^2 + 5135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146621381 is a prime.

It is a super-2 number, since 2×146621381² = 42995658732694322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146621281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73310690 + 73310691.

It is an arithmetic number, because the mean of its divisors is an integer number (73310691).

Almost surely, 2^146621381 is an apocalyptic number.

It is an amenable number.

146621381 is a deficient number, since it is larger than the sum of its proper divisors (1).

146621381 is an equidigital number, since it uses as much as digits as its factorization.

146621381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 146621381 is about 12108.7316016171. The cubic root of 146621381 is about 527.3097099695.

The spelling of 146621381 in words is "one hundred forty-six million, six hundred twenty-one thousand, three hundred eighty-one".