6155881381 has 4 divisors (see below), whose sum is σ = 6629410732. Its totient is φ = 5682352032.

The previous prime is 6155881357. The next prime is 6155881387. The reversal of 6155881381 is 1831885516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 350812900 + 5805068481 = 18730^2 + 76191^2 .

It is a cyclic number.

It is not a de Polignac number, because 6155881381 - 2¹³ = 6155873189 is a prime.

It is a super-2 number, since 2×6155881381² = 75789751153884934322, which contains 22 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 (6155881387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236764656 + ... + 236764681.

It is an arithmetic number, because the mean of its divisors is an integer number (1657352683).

Almost surely, 2^6155881381 is an apocalyptic number.

It is an amenable number.

6155881381 is a deficient number, since it is larger than the sum of its proper divisors (473529351).

6155881381 is a wasteful number, since it uses less digits than its factorization.

6155881381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473529350.

The product of its digits is 230400, while the sum is 46.

The square root of 6155881381 is about 78459.4250616202. The cubic root of 6155881381 is about 1832.7226516537.

The spelling of 6155881381 in words is "six billion, one hundred fifty-five million, eight hundred eighty-one thousand, three hundred eighty-one".