1381922661 has 16 divisors (see below), whose sum is σ = 2106349184. Its totient is φ = 789459264.

The previous prime is 1381922651. The next prime is 1381922723. The reversal of 1381922661 is 1662291831.

It is not a de Polignac number, because 1381922661 - 2⁷ = 1381922533 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381922621) 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, 107595 + ... + 119751.

It is an arithmetic number, because the mean of its divisors is an integer number (131646824).

Almost surely, 2^1381922661 is an apocalyptic number.

It is an amenable number.

1381922661 is a deficient number, since it is larger than the sum of its proper divisors (724426523).

1381922661 is a wasteful number, since it uses less digits than its factorization.

1381922661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17580.

The product of its digits is 31104, while the sum is 39.

The square root of 1381922661 is about 37174.2203818722. The cubic root of 1381922661 is about 1113.8530870557.

The spelling of 1381922661 in words is "one billion, three hundred eighty-one million, nine hundred twenty-two thousand, six hundred sixty-one".