718022381 has 4 divisors (see below), whose sum is σ = 735535164. Its totient is φ = 700509600.

The previous prime is 718022351. The next prime is 718022411. The reversal of 718022381 is 183220817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183220817 = 13 ⋅14093909.

It is an interprime number because it is at equal distance from previous prime (718022351) and next prime (718022411).

It can be written as a sum of positive squares in 2 ways, for example, as 168870025 + 549152356 = 12995^2 + 23434^2 .

It is not a de Polignac number, because 718022381 - 2¹⁴ = 718005997 is a prime.

It is a super-2 number, since 2×718022381² = 1031112279233818322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718022311) 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, 8756330 + ... + 8756411.

It is an arithmetic number, because the mean of its divisors is an integer number (183883791).

Almost surely, 2^718022381 is an apocalyptic number.

It is an amenable number.

718022381 is a deficient number, since it is larger than the sum of its proper divisors (17512783).

718022381 is a wasteful number, since it uses less digits than its factorization.

718022381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17512782.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 718022381 is about 26795.9396364449. The cubic root of 718022381 is about 895.4595939617.

The spelling of 718022381 in words is "seven hundred eighteen million, twenty-two thousand, three hundred eighty-one".