40310981 has 2 divisors, whose sum is σ = 40310982. Its totient is φ = 40310980.

The previous prime is 40310971. The next prime is 40310987. The reversal of 40310981 is 18901304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26368225 + 13942756 = 5135^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 40310981 - 2¹⁰ = 40309957 is a prime.

It is a super-2 number, since 2×40310981² = 3249950378364722, which contains 22 as substring.

It is equal to p_2451455 and since 40310981 and 2451455 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40310981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40310987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20155490 + 20155491.

It is an arithmetic number, because the mean of its divisors is an integer number (20155491).

Almost surely, 2^40310981 is an apocalyptic number.

It is an amenable number.

40310981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40310981 is an equidigital number, since it uses as much as digits as its factorization.

40310981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 40310981 is about 6349.0929273401. The cubic root of 40310981 is about 342.8791857769.

The spelling of 40310981 in words is "forty million, three hundred ten thousand, nine hundred eighty-one".