1371774491 has 4 divisors (see below), whose sum is σ = 1382246184. Its totient is φ = 1361302800.

The previous prime is 1371774479. The next prime is 1371774499. The reversal of 1371774491 is 1944771731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1371774491 - 2¹⁸ = 1371512347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1371774499) 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, 5235650 + ... + 5235911.

It is an arithmetic number, because the mean of its divisors is an integer number (345561546).

Almost surely, 2^1371774491 is an apocalyptic number.

1371774491 is a deficient number, since it is larger than the sum of its proper divisors (10471693).

1371774491 is a wasteful number, since it uses less digits than its factorization.

1371774491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10471692.

The product of its digits is 148176, while the sum is 44.

The square root of 1371774491 is about 37037.4741444392. The cubic root of 1371774491 is about 1111.1198532420.

The spelling of 1371774491 in words is "one billion, three hundred seventy-one million, seven hundred seventy-four thousand, four hundred ninety-one".