2097407981 has 2 divisors, whose sum is σ = 2097407982. Its totient is φ = 2097407980.

The previous prime is 2097407971. The next prime is 2097407987. The reversal of 2097407981 is 1897047902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1786414756 + 310993225 = 42266^2 + 17635^2 .

It is a cyclic number.

It is not a de Polignac number, because 2097407981 - 2¹⁸ = 2097145837 is a prime.

It is a super-2 number, since 2×2097407981² = 8798240477524992722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2097407987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1048703990 + 1048703991.

It is an arithmetic number, because the mean of its divisors is an integer number (1048703991).

Almost surely, 2^2097407981 is an apocalyptic number.

It is an amenable number.

2097407981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2097407981 is an equidigital number, since it uses as much as digits as its factorization.

2097407981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 2097407981 is about 45797.4669714385. The cubic root of 2097407981 is about 1280.0520773490.

The spelling of 2097407981 in words is "two billion, ninety-seven million, four hundred seven thousand, nine hundred eighty-one".