1345059781 has 8 divisors (see below), whose sum is σ = 1448811000. Its totient is φ = 1241349312.

The previous prime is 1345059763. The next prime is 1345059787. The reversal of 1345059781 is 1879505431.

It can be written as a sum of positive squares in 4 ways, for example, as 178222500 + 1166837281 = 13350^2 + 34159^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345059781 is a prime.

It is a super-2 number, since 2×1345059781² = 3618371628927535922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345059787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121431 + ... + 132043.

It is an arithmetic number, because the mean of its divisors is an integer number (181101375).

Almost surely, 2^1345059781 is an apocalyptic number.

It is an amenable number.

1345059781 is a deficient number, since it is larger than the sum of its proper divisors (103751219).

1345059781 is a wasteful number, since it uses less digits than its factorization.

1345059781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20375.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 1345059781 is about 36675.0566598063. The cubic root of 1345059781 is about 1103.8596593665.

The spelling of 1345059781 in words is "one billion, three hundred forty-five million, fifty-nine thousand, seven hundred eighty-one".