2157257001 has 4 divisors (see below), whose sum is σ = 2876342672. Its totient is φ = 1438171332.

The previous prime is 2157256999. The next prime is 2157257021. The reversal of 2157257001 is 1007527512.

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 not a de Polignac number, because 2157257001 - 2¹ = 2157256999 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157257001.

It is not an unprimeable number, because it can be changed into a prime (2157257021) 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, 359542831 + ... + 359542836.

It is an arithmetic number, because the mean of its divisors is an integer number (719085668).

Almost surely, 2^2157257001 is an apocalyptic number.

It is an amenable number.

2157257001 is a deficient number, since it is larger than the sum of its proper divisors (719085671).

2157257001 is an equidigital number, since it uses as much as digits as its factorization.

2157257001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719085670.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 2157257001 is about 46446.2808091240. The cubic root of 2157257001 is about 1292.1133959155.

The spelling of 2157257001 in words is "two billion, one hundred fifty-seven million, two hundred fifty-seven thousand, one".