146431561 has 2 divisors, whose sum is σ = 146431562. Its totient is φ = 146431560.

The previous prime is 146431559. The next prime is 146431567. The reversal of 146431561 is 165134641.

146431561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127238400 + 19193161 = 11280^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 146431561 - 2¹ = 146431559 is a prime.

Together with 146431559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (146431567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73215780 + 73215781.

It is an arithmetic number, because the mean of its divisors is an integer number (73215781).

Almost surely, 2^146431561 is an apocalyptic number.

It is an amenable number.

146431561 is a deficient number, since it is larger than the sum of its proper divisors (1).

146431561 is an equidigital number, since it uses as much as digits as its factorization.

146431561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 146431561 is about 12100.8909176143. The cubic root of 146431561 is about 527.0820552343.

The spelling of 146431561 in words is "one hundred forty-six million, four hundred thirty-one thousand, five hundred sixty-one".