1391681069 has 4 divisors (see below), whose sum is σ = 1396972896. Its totient is φ = 1386389244.

The previous prime is 1391681063. The next prime is 1391681089. The reversal of 1391681069 is 9601861931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9601861931 = 2131 ⋅4505801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391681069 is a prime.

It is a super-2 number, since 2×1391681069² = 3873552395625965522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391681063) 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, 2645519 + ... + 2646044.

It is an arithmetic number, because the mean of its divisors is an integer number (349243224).

Almost surely, 2^1391681069 is an apocalyptic number.

It is an amenable number.

1391681069 is a deficient number, since it is larger than the sum of its proper divisors (5291827).

1391681069 is an equidigital number, since it uses as much as digits as its factorization.

1391681069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291826.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1391681069 is about 37305.2418434729. The cubic root of 1391681069 is about 1116.4687539450.

The spelling of 1391681069 in words is "one billion, three hundred ninety-one million, six hundred eighty-one thousand, sixty-nine".