146409581 has 2 divisors, whose sum is σ = 146409582. Its totient is φ = 146409580.

The previous prime is 146409493. The next prime is 146409583. The reversal of 146409581 is 185904641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 24108100 = 11059^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 146409581 - 2¹⁴ = 146393197 is a prime.

It is a super-2 number, since 2×146409581² = 42871530817191122, which contains 22 as substring.

Together with 146409583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146409583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73204790 + 73204791.

It is an arithmetic number, because the mean of its divisors is an integer number (73204791).

Almost surely, 2^146409581 is an apocalyptic number.

It is an amenable number.

146409581 is a deficient number, since it is larger than the sum of its proper divisors (1).

146409581 is an equidigital number, since it uses as much as digits as its factorization.

146409581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 146409581 is about 12099.9826859380. The cubic root of 146409581 is about 527.0556814953.

The spelling of 146409581 in words is "one hundred forty-six million, four hundred nine thousand, five hundred eighty-one".