74971381 has 2 divisors, whose sum is σ = 74971382. Its totient is φ = 74971380.

The previous prime is 74971373. The next prime is 74971387. The reversal of 74971381 is 18317947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48024900 + 26946481 = 6930^2 + 5191^2 .

It is an emirp because it is prime and its reverse (18317947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74971381 - 2³ = 74971373 is a prime.

It is a super-2 number, since 2×74971381² = 11241415938094322, 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 (74971387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37485690 + 37485691.

It is an arithmetic number, because the mean of its divisors is an integer number (37485691).

Almost surely, 2^74971381 is an apocalyptic number.

It is an amenable number.

74971381 is a deficient number, since it is larger than the sum of its proper divisors (1).

74971381 is an equidigital number, since it uses as much as digits as its factorization.

74971381 is an evil number, because the sum of its binary digits is even.

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

The square root of 74971381 is about 8658.6015614532. The cubic root of 74971381 is about 421.6626853834.

The spelling of 74971381 in words is "seventy-four million, nine hundred seventy-one thousand, three hundred eighty-one".