718771421 has 4 divisors (see below), whose sum is σ = 719660700. Its totient is φ = 717882144.

The previous prime is 718771393. The next prime is 718771429. The reversal of 718771421 is 124177817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124177817 = 263 ⋅472159.

It can be written as a sum of positive squares in 2 ways, for example, as 238548025 + 480223396 = 15445^2 + 21914^2 .

It is a cyclic number.

It is not a de Polignac number, because 718771421 - 2¹⁸ = 718509277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718771429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443426 + ... + 445043.

It is an arithmetic number, because the mean of its divisors is an integer number (179915175).

Almost surely, 2^718771421 is an apocalyptic number.

It is an amenable number.

718771421 is a deficient number, since it is larger than the sum of its proper divisors (889279).

718771421 is an equidigital number, since it uses as much as digits as its factorization.

718771421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889278.

The product of its digits is 21952, while the sum is 38.

The square root of 718771421 is about 26809.9127376424. The cubic root of 718771421 is about 895.7708665025.

The spelling of 718771421 in words is "seven hundred eighteen million, seven hundred seventy-one thousand, four hundred twenty-one".