1261853159 has 8 divisors (see below), whose sum is σ = 1452645408. Its totient is φ = 1073692800.

The previous prime is 1261853149. The next prime is 1261853167. The reversal of 1261853159 is 9513581621.

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 1261853159 - 2¹² = 1261849063 is a prime.

It is a super-3 number, since 3×1261853159³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261853129) 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, 656942 + ... + 658859.

It is an arithmetic number, because the mean of its divisors is an integer number (181580676).

Almost surely, 2^1261853159 is an apocalyptic number.

1261853159 is a deficient number, since it is larger than the sum of its proper divisors (190792249).

1261853159 is a wasteful number, since it uses less digits than its factorization.

1261853159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315945.

The product of its digits is 64800, while the sum is 41.

The square root of 1261853159 is about 35522.5725279012. The cubic root of 1261853159 is about 1080.6115532179.

The spelling of 1261853159 in words is "one billion, two hundred sixty-one million, eight hundred fifty-three thousand, one hundred fifty-nine".