2551405121 has 4 divisors (see below), whose sum is σ = 2633708544. Its totient is φ = 2469101700.

The previous prime is 2551405117. The next prime is 2551405127. The reversal of 2551405121 is 1215041552.

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 a cyclic number.

It is not a de Polignac number, because 2551405121 - 2² = 2551405117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551405127) 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, 41151665 + ... + 41151726.

It is an arithmetic number, because the mean of its divisors is an integer number (658427136).

Almost surely, 2^2551405121 is an apocalyptic number.

It is an amenable number.

2551405121 is a deficient number, since it is larger than the sum of its proper divisors (82303423).

2551405121 is an equidigital number, since it uses as much as digits as its factorization.

2551405121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82303422.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 2551405121 is about 50511.4355468145. The cubic root of 2551405121 is about 1366.4480995371.

Adding to 2551405121 its reverse (1215041552), we get a palindrome (3766446673).

The spelling of 2551405121 in words is "two billion, five hundred fifty-one million, four hundred five thousand, one hundred twenty-one".