1612321261 has 16 divisors (see below), whose sum is σ = 1668833280. Its totient is φ = 1557042480.

The previous prime is 1612321219. The next prime is 1612321267. The reversal of 1612321261 is 1621232161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1612321261 - 2¹⁵ = 1612288493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612321267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800746 + ... + 802756.

It is an arithmetic number, because the mean of its divisors is an integer number (104302080).

Almost surely, 2^1612321261 is an apocalyptic number.

It is an amenable number.

1612321261 is a deficient number, since it is larger than the sum of its proper divisors (56512019).

1612321261 is a wasteful number, since it uses less digits than its factorization.

1612321261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304.

The product of its digits is 864, while the sum is 25.

The square root of 1612321261 is about 40153.7203880288. The cubic root of 1612321261 is about 1172.6017202088.

The spelling of 1612321261 in words is "one billion, six hundred twelve million, three hundred twenty-one thousand, two hundred sixty-one".