145621139 has 2 divisors, whose sum is σ = 145621140. Its totient is φ = 145621138.

The previous prime is 145621123. The next prime is 145621163. The reversal of 145621139 is 931126541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145621139 - 2⁴ = 145621123 is a prime.

It is a super-2 number, since 2×145621139² = 42411032247314642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145621109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810569 + 72810570.

It is an arithmetic number, because the mean of its divisors is an integer number (72810570).

Almost surely, 2^145621139 is an apocalyptic number.

145621139 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621139 is an equidigital number, since it uses as much as digits as its factorization.

145621139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 145621139 is about 12067.3584101907. The cubic root of 145621139 is about 526.1078814610.

The spelling of 145621139 in words is "one hundred forty-five million, six hundred twenty-one thousand, one hundred thirty-nine".