1997634451 has 16 divisors (see below), whose sum is σ = 2080512000. Its totient is φ = 1915992000.

The previous prime is 1997634439. The next prime is 1997634473. The reversal of 1997634451 is 1544367991.

It is a cyclic number.

It is not a de Polignac number, because 1997634451 - 2⁷ = 1997634323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997634395 and 1997634404.

It is not an unprimeable number, because it can be changed into a prime (1997634481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3323551 + ... + 3324151.

It is an arithmetic number, because the mean of its divisors is an integer number (130032000).

Almost surely, 2^1997634451 is an apocalyptic number.

1997634451 is a deficient number, since it is larger than the sum of its proper divisors (82877549).

1997634451 is a wasteful number, since it uses less digits than its factorization.

1997634451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410.

The product of its digits is 816480, while the sum is 49.

The square root of 1997634451 is about 44694.9040831279. The cubic root of 1997634451 is about 1259.4241197613.

The spelling of 1997634451 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-four thousand, four hundred fifty-one".