1351997771 has 8 divisors (see below), whose sum is σ = 1357038144. Its totient is φ = 1346967880.

The previous prime is 1351997767. The next prime is 1351997783. The reversal of 1351997771 is 1777991531.

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

It is a cyclic number.

It is not a de Polignac number, because 1351997771 - 2² = 1351997767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351997071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328436 + ... + 332526.

It is an arithmetic number, because the mean of its divisors is an integer number (169629768).

Almost surely, 2^1351997771 is an apocalyptic number.

1351997771 is a deficient number, since it is larger than the sum of its proper divisors (5040373).

1351997771 is an equidigital number, since it uses as much as digits as its factorization.

1351997771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241.

The product of its digits is 416745, while the sum is 50.

The square root of 1351997771 is about 36769.5223112838. The cubic root of 1351997771 is about 1105.7543550609.

The spelling of 1351997771 in words is "one billion, three hundred fifty-one million, nine hundred ninety-seven thousand, seven hundred seventy-one".