1381052491 has 16 divisors (see below), whose sum is σ = 1745700544. Its totient is φ = 1063165824.

The previous prime is 1381052479. The next prime is 1381052501. The reversal of 1381052491 is 1942501831.

It is not a de Polignac number, because 1381052491 - 2⁵ = 1381052459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381052401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201720 + ... + 208453.

It is an arithmetic number, because the mean of its divisors is an integer number (109106284).

Almost surely, 2^1381052491 is an apocalyptic number.

1381052491 is a deficient number, since it is larger than the sum of its proper divisors (364648053).

1381052491 is a wasteful number, since it uses less digits than its factorization.

1381052491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410230.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1381052491 is about 37162.5145946826. The cubic root of 1381052491 is about 1113.6192473779.

The spelling of 1381052491 in words is "one billion, three hundred eighty-one million, fifty-two thousand, four hundred ninety-one".