11745981 has 12 divisors (see below), whose sum is σ = 18271708. Its totient is φ = 7228224.

The previous prime is 11745973. The next prime is 11746001. The reversal of 11745981 is 18954711.

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 8173881 = 1890^2 + 2859^2 .

It is not a de Polignac number, because 11745981 - 2³ = 11745973 is a prime.

It is a super-2 number, since 2×11745981² = 275936139304722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11745901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50080 + ... + 50313.

Almost surely, 2^11745981 is an apocalyptic number.

It is an amenable number.

11745981 is a deficient number, since it is larger than the sum of its proper divisors (6525727).

11745981 is a wasteful number, since it uses less digits than its factorization.

11745981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100412 (or 100409 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 11745981 is about 3427.2410186621. The cubic root of 11745981 is about 227.3158740434.

The spelling of 11745981 in words is "eleven million, seven hundred forty-five thousand, nine hundred eighty-one".