1285742161 has 8 divisors (see below), whose sum is σ = 1403457984. Its totient is φ = 1168164720.

The previous prime is 1285742153. The next prime is 1285742177. The reversal of 1285742161 is 1612475821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1285742161 - 2³ = 1285742153 is a prime.

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 1285742161.

It is not an unprimeable number, because it can be changed into a prime (1285742111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14661 + ... + 52786.

It is an arithmetic number, because the mean of its divisors is an integer number (175432248).

Almost surely, 2^1285742161 is an apocalyptic number.

1285742161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1285742161 is a deficient number, since it is larger than the sum of its proper divisors (117715823).

1285742161 is a wasteful number, since it uses less digits than its factorization.

1285742161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69191.

The product of its digits is 26880, while the sum is 37.

The square root of 1285742161 is about 35857.2469802131. The cubic root of 1285742161 is about 1087.3882313635.

The spelling of 1285742161 in words is "one billion, two hundred eighty-five million, seven hundred forty-two thousand, one hundred sixty-one".