146989721 has 2 divisors, whose sum is σ = 146989722. Its totient is φ = 146989720.

The previous prime is 146989699. The next prime is 146989741. The reversal of 146989721 is 127989641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89775625 + 57214096 = 9475^2 + 7564^2 .

It is a cyclic number.

It is not a de Polignac number, because 146989721 - 2⁶ = 146989657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (146989741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73494860 + 73494861.

It is an arithmetic number, because the mean of its divisors is an integer number (73494861).

Almost surely, 2^146989721 is an apocalyptic number.

It is an amenable number.

146989721 is a deficient number, since it is larger than the sum of its proper divisors (1).

146989721 is an equidigital number, since it uses as much as digits as its factorization.

146989721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 146989721 is about 12123.9317467561. The cubic root of 146989721 is about 527.7509071930.

The spelling of 146989721 in words is "one hundred forty-six million, nine hundred eighty-nine thousand, seven hundred twenty-one".