681402154 has 8 divisors (see below), whose sum is σ = 1057348260. Its totient is φ = 328952736.

The previous prime is 681402131. The next prime is 681402173. The reversal of 681402154 is 451204186.

It can be written as a sum of positive squares in 2 ways, for example, as 654080625 + 27321529 = 25575^2 + 5227^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 5874099 + ... + 5874214.

Almost surely, 2^681402154 is an apocalyptic number.

681402154 is a deficient number, since it is larger than the sum of its proper divisors (375946106).

681402154 is a wasteful number, since it uses less digits than its factorization.

681402154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11748344.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 681402154 is about 26103.6808515581. The cubic root of 681402154 is about 879.9699344067.

The spelling of 681402154 in words is "six hundred eighty-one million, four hundred two thousand, one hundred fifty-four".