1691404252 has 6 divisors (see below), whose sum is σ = 2959957448. Its totient is φ = 845702124.

The previous prime is 1691404249. The next prime is 1691404259. The reversal of 1691404252 is 2524041961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691404259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211425528 + ... + 211425535.

Almost surely, 2^1691404252 is an apocalyptic number.

It is an amenable number.

1691404252 is a deficient number, since it is larger than the sum of its proper divisors (1268553196).

1691404252 is a wasteful number, since it uses less digits than its factorization.

1691404252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422851067 (or 422851065 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1691404252 is about 41126.6854001146. The cubic root of 1691404252 is about 1191.4682467840.

The spelling of 1691404252 in words is "one billion, six hundred ninety-one million, four hundred four thousand, two hundred fifty-two".