9261616381 has 2 divisors, whose sum is σ = 9261616382. Its totient is φ = 9261616380.

The previous prime is 9261616373. The next prime is 9261616411. The reversal of 9261616381 is 1836161629.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4946308900 + 4315307481 = 70330^2 + 65691^2 .

It is a cyclic number.

It is not a de Polignac number, because 9261616381 - 2³ = 9261616373 is a prime.

It is a super-2 number, since 2×9261616381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9261616781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4630808190 + 4630808191.

It is an arithmetic number, because the mean of its divisors is an integer number (4630808191).

Almost surely, 2^9261616381 is an apocalyptic number.

It is an amenable number.

9261616381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9261616381 is an equidigital number, since it uses as much as digits as its factorization.

9261616381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 9261616381 is about 96237.2920493922. The cubic root of 9261616381 is about 2100.0465886112.

The spelling of 9261616381 in words is "nine billion, two hundred sixty-one million, six hundred sixteen thousand, three hundred eighty-one".