7613981 has 2 divisors, whose sum is σ = 7613982. Its totient is φ = 7613980.

The previous prime is 7613923. The next prime is 7613999. The reversal of 7613981 is 1893167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7425625 + 188356 = 2725^2 + 434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7613981 is a prime.

It is a super-2 number, since 2×7613981² = 115945413336722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7613381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3806990 + 3806991.

It is an arithmetic number, because the mean of its divisors is an integer number (3806991).

Almost surely, 2^7613981 is an apocalyptic number.

It is an amenable number.

7613981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7613981 is an equidigital number, since it uses as much as digits as its factorization.

7613981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 7613981 is about 2759.3443061713. The cubic root of 7613981 is about 196.7300019446.

The spelling of 7613981 in words is "seven million, six hundred thirteen thousand, nine hundred eighty-one".