31427255551 has 4 divisors (see below), whose sum is σ = 31428680400. Its totient is φ = 31425830704.

The previous prime is 31427255533. The next prime is 31427255557. The reversal of 31427255551 is 15555272413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15555272413 = 1097 ⋅14179829.

It is a cyclic number.

It is not a de Polignac number, because 31427255551 - 2²¹ = 31425158399 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31427255557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678811 + ... + 723628.

It is an arithmetic number, because the mean of its divisors is an integer number (7857170100).

Almost surely, 2^31427255551 is an apocalyptic number.

31427255551 is a deficient number, since it is larger than the sum of its proper divisors (1424849).

31427255551 is a wasteful number, since it uses less digits than its factorization.

31427255551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424848.

The product of its digits is 210000, while the sum is 40.

The spelling of 31427255551 in words is "thirty-one billion, four hundred twenty-seven million, two hundred fifty-five thousand, five hundred fifty-one".