1691461690 has 16 divisors (see below), whose sum is σ = 3058288128. Its totient is φ = 673549776.

The previous prime is 1691461679. The next prime is 1691461721. The reversal of 1691461690 is 961641961.

It is a super-2 number, since 2×1691461690² = 5722085297475312200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377022 + ... + 381481.

It is an arithmetic number, because the mean of its divisors is an integer number (191143008).

Almost surely, 2^1691461690 is an apocalyptic number.

1691461690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691461690 is a deficient number, since it is larger than the sum of its proper divisors (1366826438).

1691461690 is a wasteful number, since it uses less digits than its factorization.

1691461690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758733.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1691461690 is about 41127.3836999146. The cubic root of 1691461690 is about 1191.4817335615.

The spelling of 1691461690 in words is "one billion, six hundred ninety-one million, four hundred sixty-one thousand, six hundred ninety".