1260405631 has 4 divisors (see below), whose sum is σ = 1264381992. Its totient is φ = 1256429272.

The previous prime is 1260405593. The next prime is 1260405647. The reversal of 1260405631 is 1365040621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1365040621 = 7 ⋅195005803.

It is a cyclic number.

It is not a de Polignac number, because 1260405631 - 2¹⁷ = 1260274559 is a prime.

It is a super-2 number, since 2×1260405631² = 3177244709313016322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1260405631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260405661) 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, 1987705 + ... + 1988338.

It is an arithmetic number, because the mean of its divisors is an integer number (316095498).

Almost surely, 2^1260405631 is an apocalyptic number.

1260405631 is a deficient number, since it is larger than the sum of its proper divisors (3976361).

1260405631 is an equidigital number, since it uses as much as digits as its factorization.

1260405631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976360.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1260405631 is about 35502.1919182464. The cubic root of 1260405631 is about 1080.1981892228.

The spelling of 1260405631 in words is "one billion, two hundred sixty million, four hundred five thousand, six hundred thirty-one".