71922457 has 2 divisors, whose sum is σ = 71922458. Its totient is φ = 71922456.

The previous prime is 71922443. The next prime is 71922463. The reversal of 71922457 is 75422917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 4748041 = 8196^2 + 2179^2 .

It is an emirp because it is prime and its reverse (75422917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71922457 - 2¹⁹ = 71398169 is a prime.

It is a super-3 number, since 3×71922457³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (71922757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35961228 + 35961229.

It is an arithmetic number, because the mean of its divisors is an integer number (35961229).

Almost surely, 2^71922457 is an apocalyptic number.

It is an amenable number.

71922457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71922457 is an equidigital number, since it uses as much as digits as its factorization.

71922457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 71922457 is about 8480.7108782224. The cubic root of 71922457 is about 415.8673628705.

The spelling of 71922457 in words is "seventy-one million, nine hundred twenty-two thousand, four hundred fifty-seven".