1600121391 has 32 divisors (see below), whose sum is σ = 2417942016. Its totient is φ = 932736000.

The previous prime is 1600121363. The next prime is 1600121401. The reversal of 1600121391 is 1931210061.

It is not a de Polignac number, because 1600121391 - 2¹⁷ = 1599990319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1600121291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87735 + ... + 104391.

It is an arithmetic number, because the mean of its divisors is an integer number (75560688).

Almost surely, 2^1600121391 is an apocalyptic number.

1600121391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1600121391 is a deficient number, since it is larger than the sum of its proper divisors (817820625).

1600121391 is a wasteful number, since it uses less digits than its factorization.

1600121391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16783.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1600121391 is about 40001.5173587203. The cubic root of 1600121391 is about 1169.6366736569.

The spelling of 1600121391 in words is "one billion, six hundred million, one hundred twenty-one thousand, three hundred ninety-one".