525121121491 has 16 divisors (see below), whose sum is σ = 559518812640. Its totient is φ = 491888436480.

The previous prime is 525121121479. The next prime is 525121121501. The reversal of 525121121491 is 194121121525.

It is a cyclic number.

It is not a de Polignac number, because 525121121491 - 2⁷ = 525121121363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (525121121891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332850 + ... + 1077511.

It is an arithmetic number, because the mean of its divisors is an integer number (34969925790).

Almost surely, 2^525121121491 is an apocalyptic number.

525121121491 is a deficient number, since it is larger than the sum of its proper divisors (34397691149).

525121121491 is a wasteful number, since it uses less digits than its factorization.

525121121491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410774.

The product of its digits is 7200, while the sum is 34.

Adding to 525121121491 its sum of digits (34), we get a palindrome (525121121525).

The spelling of 525121121491 in words is "five hundred twenty-five billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred ninety-one".