4378311261 has 6 divisors (see below), whose sum is σ = 6324227390. Its totient is φ = 2918874168.

The previous prime is 4378311253. The next prime is 4378311263. The reversal of 4378311261 is 1621138734.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3010716900 + 1367594361 = 54870^2 + 36981^2 .

It is not a de Polignac number, because 4378311261 - 2³ = 4378311253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378311263) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 243239506 + ... + 243239523.

Almost surely, 2^4378311261 is an apocalyptic number.

It is an amenable number.

4378311261 is a deficient number, since it is larger than the sum of its proper divisors (1945916129).

4378311261 is a wasteful number, since it uses less digits than its factorization.

4378311261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486479035 (or 486479032 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 4378311261 is about 66168.8088225865. The cubic root of 4378311261 is about 1635.9456740598.

Adding to 4378311261 its reverse (1621138734), we get a palindrome (5999449995).

The spelling of 4378311261 in words is "four billion, three hundred seventy-eight million, three hundred eleven thousand, two hundred sixty-one".