1691553388 has 24 divisors (see below), whose sum is σ = 3385815552. Its totient is φ = 724371024.

The previous prime is 1691553349. The next prime is 1691553427. The reversal of 1691553388 is 8833551961.

It is an interprime number because it is at equal distance from previous prime (1691553349) and next prime (1691553427).

It is a super-2 number, since 2×1691553388² = 5722705728908557088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 12381 + ... + 59467.

It is an arithmetic number, because the mean of its divisors is an integer number (141075648).

Almost surely, 2^1691553388 is an apocalyptic number.

It is an amenable number.

1691553388 is an abundant number, since it is smaller than the sum of its proper divisors (1694262164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691553388 is a wasteful number, since it uses less digits than its factorization.

1691553388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48381 (or 48379 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

The square root of 1691553388 is about 41128.4984894902. The cubic root of 1691553388 is about 1191.5032641541.

The spelling of 1691553388 in words is "one billion, six hundred ninety-one million, five hundred fifty-three thousand, three hundred eighty-eight".