1997616469 has 4 divisors (see below), whose sum is σ = 1998961344. Its totient is φ = 1996271596.

The previous prime is 1997616463. The next prime is 1997616479. The reversal of 1997616469 is 9646167991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1997616469 - 2¹⁵ = 1997583701 is a prime.

It is a super-2 number, since 2×1997616469² = 7980943114440055922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997616463) 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, 670207 + ... + 673180.

It is an arithmetic number, because the mean of its divisors is an integer number (499740336).

Almost surely, 2^1997616469 is an apocalyptic number.

It is an amenable number.

1997616469 is a deficient number, since it is larger than the sum of its proper divisors (1344875).

1997616469 is a wasteful number, since it uses less digits than its factorization.

1997616469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344874.

The product of its digits is 4408992, while the sum is 58.

The square root of 1997616469 is about 44694.7029188024. The cubic root of 1997616469 is about 1259.4203407862.

The spelling of 1997616469 in words is "one billion, nine hundred ninety-seven million, six hundred sixteen thousand, four hundred sixty-nine".