1997401161 has 32 divisors (see below), whose sum is σ = 3145216000. Its totient is φ = 1126878480.

The previous prime is 1997401157. The next prime is 1997401169. The reversal of 1997401161 is 1611047991.

It is not a de Polignac number, because 1997401161 - 2² = 1997401157 is a prime.

It is a super-2 number, since 2×1997401161² = 7979222795928295842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997401169) 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 in 31 ways as a sum of consecutive naturals, for example, 69006 + ... + 93576.

It is an arithmetic number, because the mean of its divisors is an integer number (98288000).

Almost surely, 2^1997401161 is an apocalyptic number.

It is an amenable number.

1997401161 is a deficient number, since it is larger than the sum of its proper divisors (1147814839).

1997401161 is an equidigital number, since it uses as much as digits as its factorization.

1997401161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24674 (or 24660 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 1997401161 is about 44692.2942015735. The cubic root of 1997401161 is about 1259.3750913566.

The spelling of 1997401161 in words is "one billion, nine hundred ninety-seven million, four hundred one thousand, one hundred sixty-one".