2215925381 has 4 divisors (see below), whose sum is σ = 2236635072. Its totient is φ = 2195215692.

The previous prime is 2215925347. The next prime is 2215925399. The reversal of 2215925381 is 1835295122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1835295122 = 2 ⋅917647561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215925381 is a prime.

It is a super-2 number, since 2×2215925381² = 9820650588319990322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215925281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10354685 + ... + 10354898.

It is an arithmetic number, because the mean of its divisors is an integer number (559158768).

Almost surely, 2^2215925381 is an apocalyptic number.

It is an amenable number.

2215925381 is a deficient number, since it is larger than the sum of its proper divisors (20709691).

2215925381 is a wasteful number, since it uses less digits than its factorization.

2215925381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20709690.

The product of its digits is 43200, while the sum is 38.

The square root of 2215925381 is about 47073.6166127057. The cubic root of 2215925381 is about 1303.7221493664.

The spelling of 2215925381 in words is "two billion, two hundred fifteen million, nine hundred twenty-five thousand, three hundred eighty-one".