1001631641 has 4 divisors (see below), whose sum is σ = 1003386384. Its totient is φ = 999876900.

The previous prime is 1001631581. The next prime is 1001631643. The reversal of 1001631641 is 1461361001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1001631641 - 2¹⁴ = 1001615257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001631643) 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, 876515 + ... + 877656.

It is an arithmetic number, because the mean of its divisors is an integer number (250846596).

Almost surely, 2^1001631641 is an apocalyptic number.

It is an amenable number.

1001631641 is a deficient number, since it is larger than the sum of its proper divisors (1754743).

1001631641 is an equidigital number, since it uses as much as digits as its factorization.

1001631641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754742.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1001631641 is about 31648.5645962025. The cubic root of 1001631641 is about 1000.5435847954.

Adding to 1001631641 its reverse (1461361001), we get a palindrome (2462992642).

The spelling of 1001631641 in words is "one billion, one million, six hundred thirty-one thousand, six hundred forty-one".