1645240031 has 2 divisors, whose sum is σ = 1645240032. Its totient is φ = 1645240030.

The previous prime is 1645240019. The next prime is 1645240033. The reversal of 1645240031 is 1300425461.

It is a strong prime.

It is an emirp because it is prime and its reverse (1300425461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645240031 - 2²² = 1641045727 is a prime.

It is a super-2 number, since 2×1645240031² = 5413629519209761922, which contains 22 as substring.

Together with 1645240033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645240033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822620015 + 822620016.

It is an arithmetic number, because the mean of its divisors is an integer number (822620016).

Almost surely, 2^1645240031 is an apocalyptic number.

1645240031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645240031 is an equidigital number, since it uses as much as digits as its factorization.

1645240031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1645240031 is about 40561.5585376105. The cubic root of 1645240031 is about 1180.5283545512.

Adding to 1645240031 its reverse (1300425461), we get a palindrome (2945665492).

The spelling of 1645240031 in words is "one billion, six hundred forty-five million, two hundred forty thousand, thirty-one".