45515531 has 2 divisors, whose sum is σ = 45515532. Its totient is φ = 45515530.

The previous prime is 45515461. The next prime is 45515539. The reversal of 45515531 is 13551554.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45515531 - 2¹⁸ = 45253387 is a prime.

It is a super-2 number, since 2×45515531² = 4143327124423922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 45515494 and 45515503.

It is not a weakly prime, because it can be changed into another prime (45515539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22757765 + 22757766.

It is an arithmetic number, because the mean of its divisors is an integer number (22757766).

Almost surely, 2^45515531 is an apocalyptic number.

45515531 is a deficient number, since it is larger than the sum of its proper divisors (1).

45515531 is an equidigital number, since it uses as much as digits as its factorization.

45515531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 29.

The square root of 45515531 is about 6746.5199177057. The cubic root of 45515531 is about 357.0424642241.

It can be divided in two parts, 4551553 and 1, that added together give a palindrome (4551554).

The spelling of 45515531 in words is "forty-five million, five hundred fifteen thousand, five hundred thirty-one".