1997461651 has 2 divisors, whose sum is σ = 1997461652. Its totient is φ = 1997461650.

The previous prime is 1997461637. The next prime is 1997461679. The reversal of 1997461651 is 1561647991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1997461651 - 2⁵ = 1997461619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1997461595 and 1997461604.

It is not a weakly prime, because it can be changed into another prime (1997465651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998730825 + 998730826.

It is an arithmetic number, because the mean of its divisors is an integer number (998730826).

Almost surely, 2^1997461651 is an apocalyptic number.

1997461651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997461651 is an equidigital number, since it uses as much as digits as its factorization.

1997461651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 1997461651 is about 44692.9709350363. The cubic root of 1997461651 is about 1259.3878043478.

The spelling of 1997461651 in words is "one billion, nine hundred ninety-seven million, four hundred sixty-one thousand, six hundred fifty-one".