1285556901 has 16 divisors (see below), whose sum is σ = 1724279040. Its totient is φ = 851950080.

The previous prime is 1285556893. The next prime is 1285556989. The reversal of 1285556901 is 1096555821.

It is a happy number.

It is not a de Polignac number, because 1285556901 - 2³ = 1285556893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285556801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518601 + ... + 521073.

It is an arithmetic number, because the mean of its divisors is an integer number (107767440).

Almost surely, 2^1285556901 is an apocalyptic number.

It is an amenable number.

1285556901 is a deficient number, since it is larger than the sum of its proper divisors (438722139).

1285556901 is a wasteful number, since it uses less digits than its factorization.

1285556901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 108000, while the sum is 42.

The square root of 1285556901 is about 35854.6635878793. The cubic root of 1285556901 is about 1087.3360023277.

The spelling of 1285556901 in words is "one billion, two hundred eighty-five million, five hundred fifty-six thousand, nine hundred one".