145139531 has 2 divisors, whose sum is σ = 145139532. Its totient is φ = 145139530.

The previous prime is 145139507. The next prime is 145139611. The reversal of 145139531 is 135931541.

145139531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145139531 - 2¹⁸ = 144877387 is a prime.

It is a super-2 number, since 2×145139531² = 42130966917799922, which contains 22 as substring.

It is equal to p_8186018 and since 145139531 and 8186018 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (145139831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72569765 + 72569766.

It is an arithmetic number, because the mean of its divisors is an integer number (72569766).

Almost surely, 2^145139531 is an apocalyptic number.

145139531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145139531 is an equidigital number, since it uses as much as digits as its factorization.

145139531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 145139531 is about 12047.3868950906. The cubic root of 145139531 is about 525.5272477930.

The spelling of 145139531 in words is "one hundred forty-five million, one hundred thirty-nine thousand, five hundred thirty-one".