7551981 has 16 divisors (see below), whose sum is σ = 11675520. Its totient is φ = 4815360.

The previous prime is 7551979. The next prime is 7551989. The reversal of 7551981 is 1891557.

It is not a de Polignac number, because 7551981 - 2¹ = 7551979 is a prime.

It is a super-2 number, since 2×7551981² = 114064834048722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7551989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5460 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (729720).

Almost surely, 2^7551981 is an apocalyptic number.

It is an amenable number.

7551981 is a deficient number, since it is larger than the sum of its proper divisors (4123539).

7551981 is a wasteful number, since it uses less digits than its factorization.

7551981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12193 (or 12187 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The square root of 7551981 is about 2748.0867890225. The cubic root of 7551981 is about 196.1945607261.

The spelling of 7551981 in words is "seven million, five hundred fifty-one thousand, nine hundred eighty-one".