145209131 has 2 divisors, whose sum is σ = 145209132. Its totient is φ = 145209130.

The previous prime is 145209109. The next prime is 145209137. The reversal of 145209131 is 131902541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145209131 - 2⁶ = 145209067 is a prime.

It is a super-2 number, since 2×145209131² = 42171383451550322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145209131.

It is not a weakly prime, because it can be changed into another prime (145209137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72604565 + 72604566.

It is an arithmetic number, because the mean of its divisors is an integer number (72604566).

Almost surely, 2^145209131 is an apocalyptic number.

145209131 is a deficient number, since it is larger than the sum of its proper divisors (1).

145209131 is an equidigital number, since it uses as much as digits as its factorization.

145209131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 145209131 is about 12050.2751420870. The cubic root of 145209131 is about 525.6112378934.

The spelling of 145209131 in words is "one hundred forty-five million, two hundred nine thousand, one hundred thirty-one".