7156981 has 6 divisors (see below), whose sum is σ = 7750050. Its totient is φ = 6606288.

The previous prime is 7156973. The next prime is 7156987. The reversal of 7156981 is 1896517.

It can be written as a sum of positive squares in 3 ways, for example, as 654481 + 6502500 = 809^2 + 2550^2 .

It is not a de Polignac number, because 7156981 - 2³ = 7156973 is a prime.

It is a super-2 number, since 2×7156981² = 102444754068722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 7156981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7156987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21006 + ... + 21343.

It is an arithmetic number, because the mean of its divisors is an integer number (1291675).

Almost surely, 2^7156981 is an apocalyptic number.

It is an amenable number.

7156981 is a deficient number, since it is larger than the sum of its proper divisors (593069).

7156981 is a wasteful number, since it uses less digits than its factorization.

7156981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42375 (or 42362 counting only the distinct ones).

The product of its digits is 15120, while the sum is 37.

The square root of 7156981 is about 2675.2534459374. The cubic root of 7156981 is about 192.7125307707.

The spelling of 7156981 in words is "seven million, one hundred fifty-six thousand, nine hundred eighty-one".