145431631 has 2 divisors, whose sum is σ = 145431632. Its totient is φ = 145431630.

The previous prime is 145431623. The next prime is 145431641. The reversal of 145431631 is 136134541.

145431631 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 an emirp because it is prime and its reverse (136134541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145431631 - 2³ = 145431623 is a prime.

It is a super-2 number, since 2×145431631² = 42300718590640322, 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 145431631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145431641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72715815 + 72715816.

It is an arithmetic number, because the mean of its divisors is an integer number (72715816).

Almost surely, 2^145431631 is an apocalyptic number.

145431631 is a deficient number, since it is larger than the sum of its proper divisors (1).

145431631 is an equidigital number, since it uses as much as digits as its factorization.

145431631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 145431631 is about 12059.5037625932. The cubic root of 145431631 is about 525.8795608244.

The spelling of 145431631 in words is "one hundred forty-five million, four hundred thirty-one thousand, six hundred thirty-one".