1631742747 has 32 divisors (see below), whose sum is σ = 2250980928. Its totient is φ = 1050955776.

The previous prime is 1631742737. The next prime is 1631742787. The reversal of 1631742747 is 7472471361.

It is a happy number.

It is not a de Polignac number, because 1631742747 - 2⁶ = 1631742683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631742699 and 1631742708.

It is not an unprimeable number, because it can be changed into a prime (1631742737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3768243 + ... + 3768675.

It is an arithmetic number, because the mean of its divisors is an integer number (70343154).

Almost surely, 2^1631742747 is an apocalyptic number.

1631742747 is a deficient number, since it is larger than the sum of its proper divisors (619238181).

1631742747 is a wasteful number, since it uses less digits than its factorization.

1631742747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its digits is 197568, while the sum is 42.

The square root of 1631742747 is about 40394.8356476419. The cubic root of 1631742747 is about 1177.2911978695.

The spelling of 1631742747 in words is "one billion, six hundred thirty-one million, seven hundred forty-two thousand, seven hundred forty-seven".