146890921 has 2 divisors, whose sum is σ = 146890922. Its totient is φ = 146890920.

The previous prime is 146890901. The next prime is 146890937. The reversal of 146890921 is 129098641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144961600 + 1929321 = 12040^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 146890921 - 2²¹ = 144793769 is a prime.

It is not a weakly prime, because it can be changed into another prime (146890901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73445460 + 73445461.

It is an arithmetic number, because the mean of its divisors is an integer number (73445461).

Almost surely, 2^146890921 is an apocalyptic number.

It is an amenable number.

146890921 is a deficient number, since it is larger than the sum of its proper divisors (1).

146890921 is an equidigital number, since it uses as much as digits as its factorization.

146890921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 146890921 is about 12119.8564760479. The cubic root of 146890921 is about 527.6326370715.

The spelling of 146890921 in words is "one hundred forty-six million, eight hundred ninety thousand, nine hundred twenty-one".