1397271491 has 8 divisors (see below), whose sum is σ = 1742052864. Its totient is φ = 1088782920.

The previous prime is 1397271479. The next prime is 1397271503. The reversal of 1397271491 is 1941727931.

It is an interprime number because it is at equal distance from previous prime (1397271479) and next prime (1397271503).

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 1397271491 - 2¹⁸ = 1397009347 is a prime.

It is a super-2 number, since 2×1397271491² = 3904735239122726162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397271451) 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, 9073115 + ... + 9073268.

It is an arithmetic number, because the mean of its divisors is an integer number (217756608).

Almost surely, 2^1397271491 is an apocalyptic number.

1397271491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1397271491 is a deficient number, since it is larger than the sum of its proper divisors (344781373).

1397271491 is a wasteful number, since it uses less digits than its factorization.

1397271491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18146401.

The product of its digits is 95256, while the sum is 44.

The square root of 1397271491 is about 37380.0948500669. The cubic root of 1397271491 is about 1117.9617187618.

The spelling of 1397271491 in words is "one billion, three hundred ninety-seven million, two hundred seventy-one thousand, four hundred ninety-one".