45221531 has 2 divisors, whose sum is σ = 45221532. Its totient is φ = 45221530.

The previous prime is 45221507. The next prime is 45221537. The reversal of 45221531 is 13512254.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45221531 is a prime.

It is a super-2 number, since 2×45221531² = 4089973731967922, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_2730740 and since 45221531 and 2730740 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 45221497 and 45221506.

It is not a weakly prime, because it can be changed into another prime (45221537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22610765 + 22610766.

It is an arithmetic number, because the mean of its divisors is an integer number (22610766).

Almost surely, 2^45221531 is an apocalyptic number.

45221531 is a deficient number, since it is larger than the sum of its proper divisors (1).

45221531 is an equidigital number, since it uses as much as digits as its factorization.

45221531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 45221531 is about 6724.6956064940. The cubic root of 45221531 is about 356.2720509178.

Adding to 45221531 its reverse (13512254), we get a palindrome (58733785).

The spelling of 45221531 in words is "forty-five million, two hundred twenty-one thousand, five hundred thirty-one".