1285672133 has 2 divisors, whose sum is σ = 1285672134. Its totient is φ = 1285672132.

The previous prime is 1285672123. The next prime is 1285672177. The reversal of 1285672133 is 3312765821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1154844289 + 130827844 = 33983^2 + 11438^2 .

It is an emirp because it is prime and its reverse (3312765821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285672133 - 2²² = 1281477829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285672103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642836066 + 642836067.

It is an arithmetic number, because the mean of its divisors is an integer number (642836067).

Almost surely, 2^1285672133 is an apocalyptic number.

It is an amenable number.

1285672133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285672133 is an equidigital number, since it uses as much as digits as its factorization.

1285672133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 1285672133 is about 35856.2704836964. The cubic root of 1285672133 is about 1087.3684894568.

The spelling of 1285672133 in words is "one billion, two hundred eighty-five million, six hundred seventy-two thousand, one hundred thirty-three".