71974381 has 2 divisors, whose sum is σ = 71974382. Its totient is φ = 71974380.

The previous prime is 71974373. The next prime is 71974387. The reversal of 71974381 is 18347917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 21706281 = 7090^2 + 4659^2 .

It is a cyclic number.

It is not a de Polignac number, because 71974381 - 2³ = 71974373 is a prime.

It is a super-2 number, since 2×71974381² = 10360623040666322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71974387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35987190 + 35987191.

It is an arithmetic number, because the mean of its divisors is an integer number (35987191).

Almost surely, 2^71974381 is an apocalyptic number.

It is an amenable number.

71974381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71974381 is an equidigital number, since it uses as much as digits as its factorization.

71974381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 71974381 is about 8483.7716258749. The cubic root of 71974381 is about 415.9674164722.

The spelling of 71974381 in words is "seventy-one million, nine hundred seventy-four thousand, three hundred eighty-one".