718412561 has 4 divisors (see below), whose sum is σ = 719964672. Its totient is φ = 716860452.

The previous prime is 718412543. The next prime is 718412573. The reversal of 718412561 is 165214817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165214817 = 379 ⋅435923.

It is a cyclic number.

It is not a de Polignac number, because 718412561 - 2¹⁰ = 718411537 is a prime.

It is a super-2 number, since 2×718412561² = 1032233215605157442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718412501) 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 in 3 ways as a sum of consecutive naturals, for example, 775361 + ... + 776286.

It is an arithmetic number, because the mean of its divisors is an integer number (179991168).

Almost surely, 2^718412561 is an apocalyptic number.

It is an amenable number.

718412561 is a deficient number, since it is larger than the sum of its proper divisors (1552111).

718412561 is a wasteful number, since it uses less digits than its factorization.

718412561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552110.

The product of its digits is 13440, while the sum is 35.

The square root of 718412561 is about 26803.2192282942. The cubic root of 718412561 is about 895.6217649308.

The spelling of 718412561 in words is "seven hundred eighteen million, four hundred twelve thousand, five hundred sixty-one".