145315531 has 2 divisors, whose sum is σ = 145315532. Its totient is φ = 145315530.

The previous prime is 145315519. The next prime is 145315537. The reversal of 145315531 is 135513541.

145315531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145315531 - 2¹⁹ = 144791243 is a prime.

It is a super-2 number, since 2×145315531² = 42233207099623922, 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 145315531.

It is not a weakly prime, because it can be changed into another prime (145315537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72657765 + 72657766.

It is an arithmetic number, because the mean of its divisors is an integer number (72657766).

Almost surely, 2^145315531 is an apocalyptic number.

145315531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145315531 is an equidigital number, since it uses as much as digits as its factorization.

145315531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 28.

The square root of 145315531 is about 12054.6891706091. The cubic root of 145315531 is about 525.7395846933.

The spelling of 145315531 in words is "one hundred forty-five million, three hundred fifteen thousand, five hundred thirty-one".