146221997 has 2 divisors, whose sum is σ = 146221998. Its totient is φ = 146221996.

The previous prime is 146221991. The next prime is 146222053. The reversal of 146221997 is 799122641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139098436 + 7123561 = 11794^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 146221997 - 2¹⁴ = 146205613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146221991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73110998 + 73110999.

It is an arithmetic number, because the mean of its divisors is an integer number (73110999).

Almost surely, 2^146221997 is an apocalyptic number.

It is an amenable number.

146221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

146221997 is an equidigital number, since it uses as much as digits as its factorization.

146221997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 146221997 is about 12092.2287854638. The cubic root of 146221997 is about 526.8304925285.

The spelling of 146221997 in words is "one hundred forty-six million, two hundred twenty-one thousand, nine hundred ninety-seven".