75411981 has 12 divisors (see below), whose sum is σ = 111462208. Its totient is φ = 49105224.

The previous prime is 75411961. The next prime is 75411989. The reversal of 75411981 is 18911457.

It is not a de Polignac number, because 75411981 - 2²² = 71217677 is a prime.

It is a super-2 number, since 2×75411981² = 11373933756688722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75411989) 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, 97045 + ... + 97818.

Almost surely, 2^75411981 is an apocalyptic number.

It is an amenable number.

75411981 is a deficient number, since it is larger than the sum of its proper divisors (36050227).

75411981 is a wasteful number, since it uses less digits than its factorization.

75411981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194912 (or 194909 counting only the distinct ones).

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

The square root of 75411981 is about 8684.0071971412. The cubic root of 75411981 is about 422.4870969298.

The spelling of 75411981 in words is "seventy-five million, four hundred eleven thousand, nine hundred eighty-one".