1081201257 has 16 divisors (see below), whose sum is σ = 1602303360. Its totient is φ = 720565200.

The previous prime is 1081201237. The next prime is 1081201259. The reversal of 1081201257 is 7521021801.

It is not a de Polignac number, because 1081201257 - 2²³ = 1072812649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1081201257.

It is not an unprimeable number, because it can be changed into a prime (1081201259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127407 + ... + 135627.

It is an arithmetic number, because the mean of its divisors is an integer number (100143960).

Almost surely, 2^1081201257 is an apocalyptic number.

It is an amenable number.

1081201257 is a deficient number, since it is larger than the sum of its proper divisors (521102103).

1081201257 is an equidigital number, since it uses as much as digits as its factorization.

1081201257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13101 (or 13095 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 1081201257 is about 32881.6249142283. The cubic root of 1081201257 is about 1026.3658197586.

The spelling of 1081201257 in words is "one billion, eighty-one million, two hundred one thousand, two hundred fifty-seven".