1631712697 has 4 divisors (see below), whose sum is σ = 1632000256. Its totient is φ = 1631425140.

The previous prime is 1631712659. The next prime is 1631712721. The reversal of 1631712697 is 7962171361.

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: 7962171361 = 89231².

It is a cyclic number.

It is not a de Polignac number, because 1631712697 - 2⁷ = 1631712569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631712097) 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, 135093 + ... + 146674.

It is an arithmetic number, because the mean of its divisors is an integer number (408000064).

Almost surely, 2^1631712697 is an apocalyptic number.

It is an amenable number.

1631712697 is a deficient number, since it is larger than the sum of its proper divisors (287559).

1631712697 is an equidigital number, since it uses as much as digits as its factorization.

1631712697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287558.

The product of its digits is 95256, while the sum is 43.

The square root of 1631712697 is about 40394.4636924418. The cubic root of 1631712697 is about 1177.2839708688.

The spelling of 1631712697 in words is "one billion, six hundred thirty-one million, seven hundred twelve thousand, six hundred ninety-seven".