90172248551391 has 4 divisors (see below), whose sum is σ = 120229664735192. Its totient is φ = 60114832367592.

The previous prime is 90172248551389. The next prime is 90172248551417. The reversal of 90172248551391 is 19315584227109.

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

It is not a de Polignac number, because 90172248551391 - 2¹ = 90172248551389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90172248556391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15028708091896 + ... + 15028708091901.

It is an arithmetic number, because the mean of its divisors is an integer number (30057416183798).

Almost surely, 2^{90172248551391} is an apocalyptic number.

90172248551391 is a deficient number, since it is larger than the sum of its proper divisors (30057416183801).

90172248551391 is a wasteful number, since it uses less digits than its factorization.

90172248551391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30057416183800.

The product of its (nonzero) digits is 5443200, while the sum is 57.

The spelling of 90172248551391 in words is "ninety trillion, one hundred seventy-two billion, two hundred forty-eight million, five hundred fifty-one thousand, three hundred ninety-one".