1285861631 has 2 divisors, whose sum is σ = 1285861632. Its totient is φ = 1285861630.

The previous prime is 1285861573. The next prime is 1285861663. The reversal of 1285861631 is 1361685821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1285861631 - 2³⁰ = 212119807 is a prime.

It is a super-2 number, since 2×1285861631² = 3306880268155960322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285861331) 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 as a sum of consecutive naturals, namely, 642930815 + 642930816.

It is an arithmetic number, because the mean of its divisors is an integer number (642930816).

Almost surely, 2^1285861631 is an apocalyptic number.

1285861631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285861631 is an equidigital number, since it uses as much as digits as its factorization.

1285861631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 1285861631 is about 35858.9128530133. The cubic root of 1285861631 is about 1087.4219100311.

The spelling of 1285861631 in words is "one billion, two hundred eighty-five million, eight hundred sixty-one thousand, six hundred thirty-one".