1351679991 has 8 divisors (see below), whose sum is σ = 1802409840. Its totient is φ = 901035072.

The previous prime is 1351679981. The next prime is 1351679993. The reversal of 1351679991 is 1999761531.

It is a happy number.

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

It is not a de Polignac number, because 1351679991 - 2¹⁹ = 1351155703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351679993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51531 + ... + 73203.

It is an arithmetic number, because the mean of its divisors is an integer number (225301230).

Almost surely, 2^1351679991 is an apocalyptic number.

1351679991 is a deficient number, since it is larger than the sum of its proper divisors (450729849).

1351679991 is a wasteful number, since it uses less digits than its factorization.

1351679991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42465.

The product of its digits is 459270, while the sum is 51.

The square root of 1351679991 is about 36765.2008154450. The cubic root of 1351679991 is about 1105.6677143478.

The spelling of 1351679991 in words is "one billion, three hundred fifty-one million, six hundred seventy-nine thousand, nine hundred ninety-one".