2523415621 has 4 divisors (see below), whose sum is σ = 2671851852. Its totient is φ = 2374979392.

The previous prime is 2523415619. The next prime is 2523415633. The reversal of 2523415621 is 1265143252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1455041025 + 1068374596 = 38145^2 + 32686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2523415621 - 2¹ = 2523415619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523415681) 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, 74218090 + ... + 74218123.

It is an arithmetic number, because the mean of its divisors is an integer number (667962963).

Almost surely, 2^2523415621 is an apocalyptic number.

It is an amenable number.

2523415621 is a deficient number, since it is larger than the sum of its proper divisors (148436231).

2523415621 is a wasteful number, since it uses less digits than its factorization.

2523415621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148436230.

The product of its digits is 14400, while the sum is 31.

The square root of 2523415621 is about 50233.6104714762. The cubic root of 2523415621 is about 1361.4329657265.

Adding to 2523415621 its reverse (1265143252), we get a palindrome (3788558873).

The spelling of 2523415621 in words is "two billion, five hundred twenty-three million, four hundred fifteen thousand, six hundred twenty-one".