913306981 has 4 divisors (see below), whose sum is σ = 917402752. Its totient is φ = 909211212.

The previous prime is 913306957. The next prime is 913306987. The reversal of 913306981 is 189603319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189603319 = 4759 ⋅39841.

It is a cyclic number.

It is not a de Polignac number, because 913306981 - 2¹¹ = 913304933 is a prime.

It is a super-2 number, since 2×913306981² = 1668259283086668722, 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 (913306987) 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, 2047551 + ... + 2047996.

It is an arithmetic number, because the mean of its divisors is an integer number (229350688).

Almost surely, 2^913306981 is an apocalyptic number.

It is an amenable number.

913306981 is a deficient number, since it is larger than the sum of its proper divisors (4095771).

913306981 is a wasteful number, since it uses less digits than its factorization.

913306981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095770.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 913306981 is about 30220.9692266810. The cubic root of 913306981 is about 970.2245489283.

The spelling of 913306981 in words is "nine hundred thirteen million, three hundred six thousand, nine hundred eighty-one".