145645631 has 2 divisors, whose sum is σ = 145645632. Its totient is φ = 145645630.

The previous prime is 145645609. The next prime is 145645639. The reversal of 145645631 is 136546541.

145645631 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 an emirp because it is prime and its reverse (136546541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145645631 - 2¹⁰ = 145644607 is a prime.

It is a super-2 number, since 2×145645631² = 42425299658776322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145645591 and 145645600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145645639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72822815 + 72822816.

It is an arithmetic number, because the mean of its divisors is an integer number (72822816).

Almost surely, 2^145645631 is an apocalyptic number.

145645631 is a deficient number, since it is larger than the sum of its proper divisors (1).

145645631 is an equidigital number, since it uses as much as digits as its factorization.

145645631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 145645631 is about 12068.3731712273. The cubic root of 145645631 is about 526.1373751458.

The spelling of 145645631 in words is "one hundred forty-five million, six hundred forty-five thousand, six hundred thirty-one".