1331690 has 8 divisors (see below), whose sum is σ = 2397060. Its totient is φ = 532672.

The previous prime is 1331683. The next prime is 1331699. The reversal of 1331690 is 961331.

It can be written as a sum of positive squares in 2 ways, for example, as 1324801 + 6889 = 1151^2 + 83^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1331690² = 3546796512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1331699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66575 + ... + 66594.

2^1331690 is an apocalyptic number.

1331690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1331690 is a deficient number, since it is larger than the sum of its proper divisors (1065370).

1331690 is a wasteful number, since it uses less digits than its factorization.

1331690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133176.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 1331690 is about 1153.9887347804. The cubic root of 1331690 is about 110.0190049807.

The spelling of 1331690 in words is "one million, three hundred thirty-one thousand, six hundred ninety".