45131531 has 2 divisors, whose sum is σ = 45131532. Its totient is φ = 45131530.

The previous prime is 45131507. The next prime is 45131539. The reversal of 45131531 is 13513154.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45131531 is a prime.

It is a super-2 number, since 2×45131531² = 4073710180807922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 45131497 and 45131506.

It is not a weakly prime, because it can be changed into another prime (45131539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22565765 + 22565766.

It is an arithmetic number, because the mean of its divisors is an integer number (22565766).

Almost surely, 2^45131531 is an apocalyptic number.

45131531 is a deficient number, since it is larger than the sum of its proper divisors (1).

45131531 is an equidigital number, since it uses as much as digits as its factorization.

45131531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 23.

The square root of 45131531 is about 6718.0005209884. Note that the first 3 decimals coincide. The cubic root of 45131531 is about 356.0355427838.

Adding to 45131531 its reverse (13513154), we get a palindrome (58644685).

It can be divided in two parts, 4513153 and 1, that added together give a palindrome (4513154).

The spelling of 45131531 in words is "forty-five million, one hundred thirty-one thousand, five hundred thirty-one".