2157501 has 4 divisors (see below), whose sum is σ = 2876672. Its totient is φ = 1438332.

The previous prime is 2157499. The next prime is 2157503. The reversal of 2157501 is 1057512.

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.

It is an interprime number because it is at equal distance from previous prime (2157499) and next prime (2157503).

It is not a de Polignac number, because 2157501 - 2¹ = 2157499 is a prime.

It is a D-number.

It is a Duffinian number.

2157501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157503) 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 3 ways as a sum of consecutive naturals, for example, 359581 + ... + 359586.

It is an arithmetic number, because the mean of its divisors is an integer number (719168).

2^2157501 is an apocalyptic number.

It is an amenable number.

2157501 is a deficient number, since it is larger than the sum of its proper divisors (719171).

2157501 is an equidigital number, since it uses as much as digits as its factorization.

2157501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719170.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 2157501 is about 1468.8434225608. The cubic root of 2157501 is about 129.2162109396.

The spelling of 2157501 in words is "two million, one hundred fifty-seven thousand, five hundred one".