1997036651 has 4 divisors (see below), whose sum is σ = 2045744904. Its totient is φ = 1948328400.

The previous prime is 1997036641. The next prime is 1997036681. The reversal of 1997036651 is 1566307991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997036651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997036596 and 1997036605.

It is not an unprimeable number, because it can be changed into a prime (1997036621) 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, 24354065 + ... + 24354146.

It is an arithmetic number, because the mean of its divisors is an integer number (511436226).

Almost surely, 2^1997036651 is an apocalyptic number.

1997036651 is a deficient number, since it is larger than the sum of its proper divisors (48708253).

1997036651 is an equidigital number, since it uses as much as digits as its factorization.

1997036651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48708252.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1997036651 is about 44688.2160194385. The cubic root of 1997036651 is about 1259.2984780134.

The spelling of 1997036651 in words is "one billion, nine hundred ninety-seven million, thirty-six thousand, six hundred fifty-one".