145429321 has 2 divisors, whose sum is σ = 145429322. Its totient is φ = 145429320.

The previous prime is 145429301. The next prime is 145429367. The reversal of 145429321 is 123924541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139358025 + 6071296 = 11805^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 145429321 - 2¹⁵ = 145396553 is a prime.

It is a super-2 number, since 2×145429321² = 42299374813042082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145429301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72714660 + 72714661.

It is an arithmetic number, because the mean of its divisors is an integer number (72714661).

Almost surely, 2^145429321 is an apocalyptic number.

It is an amenable number.

145429321 is a deficient number, since it is larger than the sum of its proper divisors (1).

145429321 is an equidigital number, since it uses as much as digits as its factorization.

145429321 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 145429321 is about 12059.4079871277. The cubic root of 145429321 is about 525.8767764961.

The spelling of 145429321 in words is "one hundred forty-five million, four hundred twenty-nine thousand, three hundred twenty-one".