1381491 has 6 divisors (see below), whose sum is σ = 1995500. Its totient is φ = 920988.

The previous prime is 1381489. The next prime is 1381493. The reversal of 1381491 is 1941831.

It is an interprime number because it is at equal distance from previous prime (1381489) and next prime (1381493).

It is not a de Polignac number, because 1381491 - 2¹ = 1381489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76741 + ... + 76758.

2^1381491 is an apocalyptic number.

1381491 is a deficient number, since it is larger than the sum of its proper divisors (614009).

1381491 is a wasteful number, since it uses less digits than its factorization.

1381491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153505 (or 153502 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1381491 is about 1175.3684528691. The cubic root of 1381491 is about 111.3737099617.

The spelling of 1381491 in words is "one million, three hundred eighty-one thousand, four hundred ninety-one".