691937954 has 12 divisors (see below), whose sum is σ = 1045594914. Its totient is φ = 343425024.

The previous prime is 691937951. The next prime is 691937977. The reversal of 691937954 is 459739196.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 641456929 + 50481025 = 25327^2 + 7105^2 .

It is a super-2 number, since 2×691937954² = 957556264371412232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691937896 and 691937905.

It is not an unprimeable number, because it can be changed into a prime (691937951) 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 5 ways as a sum of consecutive naturals, for example, 28322 + ... + 46754.

Almost surely, 2^691937954 is an apocalyptic number.

691937954 is a deficient number, since it is larger than the sum of its proper divisors (353656960).

691937954 is a wasteful number, since it uses less digits than its factorization.

691937954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18709 (or 18572 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 53.

The square root of 691937954 is about 26304.7135319889. The cubic root of 691937954 is about 884.4821058358.

The spelling of 691937954 in words is "six hundred ninety-one million, nine hundred thirty-seven thousand, nine hundred fifty-four".