11961945 has 16 divisors (see below), whose sum is σ = 21265920. Its totient is φ = 6379632.

The previous prime is 11961899. The next prime is 11961967. The reversal of 11961945 is 54916911.

11961945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11961945 - 2¹¹ = 11959897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44169 + ... + 44438.

It is an arithmetic number, because the mean of its divisors is an integer number (1329120).

Almost surely, 2^11961945 is an apocalyptic number.

11961945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11961945 is a deficient number, since it is larger than the sum of its proper divisors (9303975).

11961945 is an equidigital number, since it uses as much as digits as its factorization.

11961945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88621 (or 88615 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 11961945 is about 3458.6044873619. The cubic root of 11961945 is about 228.7005805630.

The spelling of 11961945 in words is "eleven million, nine hundred sixty-one thousand, nine hundred forty-five".