1631742749 has 8 divisors (see below), whose sum is σ = 2008298880. Its totient is φ = 1291049136.

The previous prime is 1631742737. The next prime is 1631742787. The reversal of 1631742749 is 9472471361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1631742749 - 2²⁴ = 1614965533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631742649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8965529 + ... + 8965710.

It is an arithmetic number, because the mean of its divisors is an integer number (251037360).

Almost surely, 2^1631742749 is an apocalyptic number.

It is an amenable number.

1631742749 is a deficient number, since it is larger than the sum of its proper divisors (376556131).

1631742749 is a wasteful number, since it uses less digits than its factorization.

1631742749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17931259.

The product of its digits is 254016, while the sum is 44.

The square root of 1631742749 is about 40394.8356723975. The cubic root of 1631742749 is about 1177.2911983505.

The spelling of 1631742749 in words is "one billion, six hundred thirty-one million, seven hundred forty-two thousand, seven hundred forty-nine".