146721973 has 2 divisors, whose sum is σ = 146721974. Its totient is φ = 146721972.

The previous prime is 146721961. The next prime is 146721989. The reversal of 146721973 is 379127641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98863249 + 47858724 = 9943^2 + 6918^2 .

It is a cyclic number.

It is not a de Polignac number, because 146721973 - 2¹³ = 146713781 is a prime.

It is a super-2 number, since 2×146721973² = 43054674722025458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146721923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73360986 + 73360987.

It is an arithmetic number, because the mean of its divisors is an integer number (73360987).

Almost surely, 2^146721973 is an apocalyptic number.

It is an amenable number.

146721973 is a deficient number, since it is larger than the sum of its proper divisors (1).

146721973 is an equidigital number, since it uses as much as digits as its factorization.

146721973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 146721973 is about 12112.8845862577. The cubic root of 146721973 is about 527.4302722236.

The spelling of 146721973 in words is "one hundred forty-six million, seven hundred twenty-one thousand, nine hundred seventy-three".