1381021455 has 64 divisors (see below), whose sum is σ = 2457216000. Its totient is φ = 656747520.

The previous prime is 1381021429. The next prime is 1381021471. The reversal of 1381021455 is 5541201831.

It is not a de Polignac number, because 1381021455 - 2⁵ = 1381021423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2305246 + ... + 2305844.

It is an arithmetic number, because the mean of its divisors is an integer number (38394000).

Almost surely, 2^1381021455 is an apocalyptic number.

1381021455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1381021455 is a deficient number, since it is larger than the sum of its proper divisors (1076194545).

1381021455 is a wasteful number, since it uses less digits than its factorization.

1381021455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 1381021455 is about 37162.0970210240. The cubic root of 1381021455 is about 1113.6109052991.

The spelling of 1381021455 in words is "one billion, three hundred eighty-one million, twenty-one thousand, four hundred fifty-five".