681437455 has 4 divisors (see below), whose sum is σ = 817724952. Its totient is φ = 545149960.

The previous prime is 681437441. The next prime is 681437461. The reversal of 681437455 is 554734186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554734186 = 2 ⋅277367093.

It is not a de Polignac number, because 681437455 - 2⁷ = 681437327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68143741 + ... + 68143750.

It is an arithmetic number, because the mean of its divisors is an integer number (204431238).

Almost surely, 2^681437455 is an apocalyptic number.

681437455 is a deficient number, since it is larger than the sum of its proper divisors (136287497).

681437455 is a wasteful number, since it uses less digits than its factorization.

681437455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136287496.

The product of its digits is 403200, while the sum is 43.

The square root of 681437455 is about 26104.3570118094. The cubic root of 681437455 is about 879.9851301723.

The spelling of 681437455 in words is "six hundred eighty-one million, four hundred thirty-seven thousand, four hundred fifty-five".