1631040601 has 4 divisors (see below), whose sum is σ = 1631123172. Its totient is φ = 1630958032.

The previous prime is 1631040559. The next prime is 1631040629. The reversal of 1631040601 is 1060401361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1060401361 = 23 ⋅46104407.

It can be written as a sum of positive squares in 2 ways, for example, as 918150601 + 712890000 = 30301^2 + 26700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631040601 - 2¹⁷ = 1630909529 is a prime.

It is a super-2 number, since 2×1631040601² = 5320586884220882402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631040001) 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, 7791 + ... + 57643.

It is an arithmetic number, because the mean of its divisors is an integer number (407780793).

Almost surely, 2^1631040601 is an apocalyptic number.

It is an amenable number.

1631040601 is a deficient number, since it is larger than the sum of its proper divisors (82571).

1631040601 is an equidigital number, since it uses as much as digits as its factorization.

1631040601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82570.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1631040601 is about 40386.1436757708. The cubic root of 1631040601 is about 1177.1223091353.

Adding to 1631040601 its reverse (1060401361), we get a palindrome (2691441962).

The spelling of 1631040601 in words is "one billion, six hundred thirty-one million, forty thousand, six hundred one".