145420900109 has 2 divisors, whose sum is σ = 145420900110. Its totient is φ = 145420900108.

The previous prime is 145420900103. The next prime is 145420900127. The reversal of 145420900109 is 901009024541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124178712100 + 21242188009 = 352390^2 + 145747^2 .

It is a cyclic number.

It is not a de Polignac number, because 145420900109 - 2¹² = 145420896013 is a prime.

It is a super-2 number, since 2×145420900109² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145420900103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72710450054 + 72710450055.

It is an arithmetic number, because the mean of its divisors is an integer number (72710450055).

Almost surely, 2^145420900109 is an apocalyptic number.

It is an amenable number.

145420900109 is a deficient number, since it is larger than the sum of its proper divisors (1).

145420900109 is an equidigital number, since it uses as much as digits as its factorization.

145420900109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 145420900109 in words is "one hundred forty-five billion, four hundred twenty million, nine hundred thousand, one hundred nine".