1631260643 has 4 divisors (see below), whose sum is σ = 1687511040. Its totient is φ = 1575010248.

The previous prime is 1631260613. The next prime is 1631260679. The reversal of 1631260643 is 3460621361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3460621361 = 35393 ⋅97777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631260643 is a prime.

It is a super-2 number, since 2×1631260643² = 5322022570801546898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631260613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28125155 + ... + 28125212.

It is an arithmetic number, because the mean of its divisors is an integer number (421877760).

Almost surely, 2^1631260643 is an apocalyptic number.

1631260643 is a deficient number, since it is larger than the sum of its proper divisors (56250397).

1631260643 is an equidigital number, since it uses as much as digits as its factorization.

1631260643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56250396.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1631260643 is about 40388.8678103262. The cubic root of 1631260643 is about 1177.1752415393.

The spelling of 1631260643 in words is "one billion, six hundred thirty-one million, two hundred sixty thousand, six hundred forty-three".