76197421 has 2 divisors, whose sum is σ = 76197422. Its totient is φ = 76197420.

The previous prime is 76197409. The next prime is 76197427. The reversal of 76197421 is 12479167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 24860196 = 7165^2 + 4986^2 .

It is an emirp because it is prime and its reverse (12479167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76197421 - 2⁵ = 76197389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76197427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38098710 + 38098711.

It is an arithmetic number, because the mean of its divisors is an integer number (38098711).

Almost surely, 2^76197421 is an apocalyptic number.

It is an amenable number.

76197421 is a deficient number, since it is larger than the sum of its proper divisors (1).

76197421 is an equidigital number, since it uses as much as digits as its factorization.

76197421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 76197421 is about 8729.1134143165. The cubic root of 76197421 is about 423.9488134631.

It can be divided in two parts, 761974 and 21, that added together give a triangular number (761995 = T₁₂₃₄).

The spelling of 76197421 in words is "seventy-six million, one hundred ninety-seven thousand, four hundred twenty-one".