1331256045 has 32 divisors (see below), whose sum is σ = 2449262592. Its totient is φ = 604832832.

The previous prime is 1331256013. The next prime is 1331256079. The reversal of 1331256045 is 5406521331.

It is not a de Polignac number, because 1331256045 - 2⁵ = 1331256013 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21777 + ... + 56006.

It is an arithmetic number, because the mean of its divisors is an integer number (76539456).

Almost surely, 2^1331256045 is an apocalyptic number.

1331256045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331256045 is a deficient number, since it is larger than the sum of its proper divisors (1118006547).

1331256045 is a wasteful number, since it uses less digits than its factorization.

1331256045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77961.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1331256045 is about 36486.3816375370. The cubic root of 1331256045 is about 1100.0705312902.

Adding to 1331256045 its reverse (5406521331), we get a palindrome (6737777376).

The spelling of 1331256045 in words is "one billion, three hundred thirty-one million, two hundred fifty-six thousand, forty-five".