251322135551 has 2 divisors, whose sum is σ = 251322135552. Its totient is φ = 251322135550.

The previous prime is 251322135539. The next prime is 251322135563. The reversal of 251322135551 is 155531223152.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (251322135539) and next prime (251322135563).

It is a cyclic number.

It is not a de Polignac number, because 251322135551 - 2¹⁰ = 251322134527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251322135451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125661067775 + 125661067776.

It is an arithmetic number, because the mean of its divisors is an integer number (125661067776).

Almost surely, 2^251322135551 is an apocalyptic number.

251322135551 is a deficient number, since it is larger than the sum of its proper divisors (1).

251322135551 is an equidigital number, since it uses as much as digits as its factorization.

251322135551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45000, while the sum is 35.

The spelling of 251322135551 in words is "two hundred fifty-one billion, three hundred twenty-two million, one hundred thirty-five thousand, five hundred fifty-one".