1920392551 has 16 divisors (see below), whose sum is σ = 2395554048. Its totient is φ = 1495598400.

The previous prime is 1920392549. The next prime is 1920392561. The reversal of 1920392551 is 1552930291.

It is a cyclic number.

It is not a de Polignac number, because 1920392551 - 2¹ = 1920392549 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 1920392551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920392561) 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, 163971 + ... + 175291.

It is an arithmetic number, because the mean of its divisors is an integer number (149722128).

Almost surely, 2^1920392551 is an apocalyptic number.

1920392551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1920392551 is a deficient number, since it is larger than the sum of its proper divisors (475161497).

1920392551 is a wasteful number, since it uses less digits than its factorization.

1920392551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13542.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 1920392551 is about 43822.2837264331. The cubic root of 1920392551 is about 1242.9777012780.

The spelling of 1920392551 in words is "one billion, nine hundred twenty million, three hundred ninety-two thousand, five hundred fifty-one".