74212813 has 2 divisors, whose sum is σ = 74212814. Its totient is φ = 74212812.

The previous prime is 74212811. The next prime is 74212819. The reversal of 74212813 is 31821247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70610409 + 3602404 = 8403^2 + 1898^2 .

It is a cyclic number.

It is not a de Polignac number, because 74212813 - 2¹ = 74212811 is a prime.

It is a super-2 number, since 2×74212813² = 11015083226745938, which contains 22 as substring.

Together with 74212811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74212811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37106406 + 37106407.

It is an arithmetic number, because the mean of its divisors is an integer number (37106407).

Almost surely, 2^74212813 is an apocalyptic number.

It is an amenable number.

74212813 is a deficient number, since it is larger than the sum of its proper divisors (1).

74212813 is an equidigital number, since it uses as much as digits as its factorization.

74212813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 74212813 is about 8614.6858909655. The cubic root of 74212813 is about 420.2357199101.

The spelling of 74212813 in words is "seventy-four million, two hundred twelve thousand, eight hundred thirteen".