681403534 has 32 divisors (see below), whose sum is σ = 1188552960. Its totient is φ = 286944768.

The previous prime is 681403531. The next prime is 681403549. The reversal of 681403534 is 435304186.

It is a happy number.

It is a super-2 number, since 2×681403534² = 928621552295378312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681403534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681403531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540597 + ... + 541855.

It is an arithmetic number, because the mean of its divisors is an integer number (37142280).

Almost surely, 2^681403534 is an apocalyptic number.

681403534 is a deficient number, since it is larger than the sum of its proper divisors (507149426).

681403534 is a wasteful number, since it uses less digits than its factorization.

681403534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 681403534 is about 26103.7072845985. The cubic root of 681403534 is about 879.9705284551.

The spelling of 681403534 in words is "six hundred eighty-one million, four hundred three thousand, five hundred thirty-four".