2521962181 has 2 divisors, whose sum is σ = 2521962182. Its totient is φ = 2521962180.

The previous prime is 2521962067. The next prime is 2521962211. The reversal of 2521962181 is 1812691252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093886081 + 428076100 = 45759^2 + 20690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521962181 - 2¹³ = 2521953989 is a prime.

It is a super-2 number, since 2×2521962181² = 12720586484788553522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2521962181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521962881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260981090 + 1260981091.

It is an arithmetic number, because the mean of its divisors is an integer number (1260981091).

Almost surely, 2^2521962181 is an apocalyptic number.

It is an amenable number.

2521962181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521962181 is an equidigital number, since it uses as much as digits as its factorization.

2521962181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 2521962181 is about 50219.1415796806. The cubic root of 2521962181 is about 1361.1715289204.

The spelling of 2521962181 in words is "two billion, five hundred twenty-one million, nine hundred sixty-two thousand, one hundred eighty-one".