2002157501 has 4 divisors (see below), whose sum is σ = 2004096732. Its totient is φ = 2000218272.

The previous prime is 2002157497. The next prime is 2002157519. The reversal of 2002157501 is 1057512002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1057512002 = 2 ⋅528756001.

It can be written as a sum of positive squares in 2 ways, for example, as 1573708900 + 428448601 = 39670^2 + 20699^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002157501 - 2² = 2002157497 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 (2002153501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968066 + ... + 970131.

It is an arithmetic number, because the mean of its divisors is an integer number (501024183).

Almost surely, 2^2002157501 is an apocalyptic number.

It is an amenable number.

2002157501 is a deficient number, since it is larger than the sum of its proper divisors (1939231).

2002157501 is a wasteful number, since it uses less digits than its factorization.

2002157501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939230.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 2002157501 is about 44745.4746426943. The cubic root of 2002157501 is about 1260.3739339051.

Adding to 2002157501 its reverse (1057512002), we get a palindrome (3059669503).

The spelling of 2002157501 in words is "two billion, two million, one hundred fifty-seven thousand, five hundred one".