45991945 has 8 divisors (see below), whose sum is σ = 55366344. Its totient is φ = 36676224.

The previous prime is 45991943. The next prime is 45991963. The reversal of 45991945 is 54919954.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 685584 + 45306361 = 828^2 + 6731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45991945 - 2¹ = 45991943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45991895 and 45991904.

It is not an unprimeable number, because it can be changed into a prime (45991943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12924 + ... + 16093.

It is an arithmetic number, because the mean of its divisors is an integer number (6920793).

Almost surely, 2^45991945 is an apocalyptic number.

It is an amenable number.

45991945 is a deficient number, since it is larger than the sum of its proper divisors (9374399).

45991945 is a wasteful number, since it uses less digits than its factorization.

45991945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29339.

The product of its digits is 291600, while the sum is 46.

The square root of 45991945 is about 6781.7361346487. The cubic root of 45991945 is about 358.2838717861.

The spelling of 45991945 in words is "forty-five million, nine hundred ninety-one thousand, nine hundred forty-five".