1997242361 has 4 divisors (see below), whose sum is σ = 2102360400. Its totient is φ = 1892124324.

The previous prime is 1997242327. The next prime is 1997242367. The reversal of 1997242361 is 1632427991.

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: 1632427991 = 40169 ⋅40639.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997242361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997242367) 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, 52558991 + ... + 52559028.

It is an arithmetic number, because the mean of its divisors is an integer number (525590100).

Almost surely, 2^1997242361 is an apocalyptic number.

It is an amenable number.

1997242361 is a deficient number, since it is larger than the sum of its proper divisors (105118039).

1997242361 is a wasteful number, since it uses less digits than its factorization.

1997242361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105118038.

The product of its digits is 163296, while the sum is 44.

The square root of 1997242361 is about 44690.5175736420. The cubic root of 1997242361 is about 1259.3417156434.

The spelling of 1997242361 in words is "one billion, nine hundred ninety-seven million, two hundred forty-two thousand, three hundred sixty-one".