45187691 has 2 divisors, whose sum is σ = 45187692. Its totient is φ = 45187690.

The previous prime is 45187679. The next prime is 45187697. The reversal of 45187691 is 19678154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45187691 - 2⁶ = 45187627 is a prime.

It is a super-2 number, since 2×45187691² = 4083854835822962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45187697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22593845 + 22593846.

It is an arithmetic number, because the mean of its divisors is an integer number (22593846).

Almost surely, 2^45187691 is an apocalyptic number.

45187691 is a deficient number, since it is larger than the sum of its proper divisors (1).

45187691 is an equidigital number, since it uses as much as digits as its factorization.

45187691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 45187691 is about 6722.1790365922. The cubic root of 45187691 is about 356.1831607035.

The spelling of 45187691 in words is "forty-five million, one hundred eighty-seven thousand, six hundred ninety-one".