145621123 has 2 divisors, whose sum is σ = 145621124. Its totient is φ = 145621122.

The previous prime is 145621109. The next prime is 145621139. The reversal of 145621123 is 321126541.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145621123 - 2⁹ = 145620611 is a prime.

It is a super-2 number, since 2×145621123² = 42411022927562258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145621163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810561 + 72810562.

It is an arithmetic number, because the mean of its divisors is an integer number (72810562).

Almost surely, 2^145621123 is an apocalyptic number.

145621123 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621123 is an equidigital number, since it uses as much as digits as its factorization.

145621123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 145621123 is about 12067.3577472453. The cubic root of 145621123 is about 526.1078621925.

Adding to 145621123 its reverse (321126541), we get a palindrome (466747664).

The spelling of 145621123 in words is "one hundred forty-five million, six hundred twenty-one thousand, one hundred twenty-three".