7997000281 has 4 divisors (see below), whose sum is σ = 8254968064. Its totient is φ = 7739032500.

The previous prime is 7997000261. The next prime is 7997000339. The reversal of 7997000281 is 1820007997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1820007997 = 25999 ⋅70003.

It is a cyclic number.

It is not a de Polignac number, because 7997000281 - 2⁷ = 7997000153 is a prime.

It is a super-2 number, since 2×7997000281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7997000251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128983845 + ... + 128983906.

It is an arithmetic number, because the mean of its divisors is an integer number (2063742016).

Almost surely, 2^7997000281 is an apocalyptic number.

7997000281 is the 39993-rd centered decagonal number.

It is an amenable number.

7997000281 is a deficient number, since it is larger than the sum of its proper divisors (257967783).

7997000281 is a wasteful number, since it uses less digits than its factorization.

7997000281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257967782.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 7997000281 is about 89425.9485887625. The cubic root of 7997000281 is about 1999.7499921660.

The spelling of 7997000281 in words is "seven billion, nine hundred ninety-seven million, two hundred eighty-one", and thus it is an aban number.