2145901 has 4 divisors (see below), whose sum is σ = 2148832. Its totient is φ = 2142972.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145901 is 1095412.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2145901 - 2⁹ = 2145389 is a prime.

It is a super-2 number, since 2×2145901² = 9209782203602, which contains 22 as substring.

It is an Ulam 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 (2145991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (537208).

2^2145901 is an apocalyptic number.

It is an amenable number.

2145901 is a deficient number, since it is larger than the sum of its proper divisors (2931).

2145901 is a wasteful number, since it uses less digits than its factorization.

2145901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2145901 is about 1464.8894156215. The cubic root of 2145901 is about 128.9842137604.

The spelling of 2145901 in words is "two million, one hundred forty-five thousand, nine hundred one".