1381751 has 12 divisors (see below), whose sum is σ = 1626552. Its totient is φ = 1170288.

The previous prime is 1381747. The next prime is 1381759. The reversal of 1381751 is 1571831.

It is not a de Polignac number, because 1381751 - 2² = 1381747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1381751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7901 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (135546).

2^1381751 is an apocalyptic number.

1381751 is a deficient number, since it is larger than the sum of its proper divisors (244801).

1381751 is a wasteful number, since it uses less digits than its factorization.

1381751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 343 counting only the distinct ones).

The product of its digits is 840, while the sum is 26.

The square root of 1381751 is about 1175.4790512808. The cubic root of 1381751 is about 111.3806964587.

Multiplying 1381751 by its sum of digits (26), we get a triangular number (35925526 = T₈₄₇₆).

The spelling of 1381751 in words is "one million, three hundred eighty-one thousand, seven hundred fifty-one".