2520357381 has 12 divisors (see below), whose sum is σ = 3757952640. Its totient is φ = 1626036840.

The previous prime is 2520357377. The next prime is 2520357383. The reversal of 2520357381 is 1837530252.

It is a happy number.

2520357381 is a `hidden beast` number, since 2 + 5 + 2 + 0 + 3 + 573 + 81 = 666.

It is not a de Polignac number, because 2520357381 - 2² = 2520357377 is a prime.

It is a super-2 number, since 2×2520357381² = 12704402655922358322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520357383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4516491 + ... + 4517048.

It is an arithmetic number, because the mean of its divisors is an integer number (313162720).

Almost surely, 2^2520357381 is an apocalyptic number.

It is an amenable number.

2520357381 is a deficient number, since it is larger than the sum of its proper divisors (1237595259).

2520357381 is a wasteful number, since it uses less digits than its factorization.

2520357381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9033576 (or 9033573 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 2520357381 is about 50203.1610658134. The cubic root of 2520357381 is about 1360.8827496008.

The spelling of 2520357381 in words is "two billion, five hundred twenty million, three hundred fifty-seven thousand, three hundred eighty-one".