7781320101 has 8 divisors (see below), whose sum is σ = 10376045920. Its totient is φ = 5187070512.

The previous prime is 7781320093. The next prime is 7781320103. The reversal of 7781320101 is 1010231877.

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

It is not a de Polignac number, because 7781320101 - 2³ = 7781320093 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 (7781320103) 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 7 ways as a sum of consecutive naturals, for example, 79006 + ... + 147663.

It is an arithmetic number, because the mean of its divisors is an integer number (1297005740).

Almost surely, 2^7781320101 is an apocalyptic number.

It is an amenable number.

7781320101 is a deficient number, since it is larger than the sum of its proper divisors (2594725819).

7781320101 is a wasteful number, since it uses less digits than its factorization.

7781320101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238115.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 7781320101 is about 88211.7911676211. The cubic root of 7781320101 is about 1981.6080618318.

Adding to 7781320101 its reverse (1010231877), we get a palindrome (8791551978).

The spelling of 7781320101 in words is "seven billion, seven hundred eighty-one million, three hundred twenty thousand, one hundred one".