31441563977 has 4 divisors (see below), whose sum is σ = 31719808020. Its totient is φ = 31163319936.

The previous prime is 31441563973. The next prime is 31441564003. The reversal of 31441563977 is 77936514413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2493604096 + 28947959881 = 49936^2 + 170141^2 .

It is a cyclic number.

It is not a de Polignac number, because 31441563977 - 2² = 31441563973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31441563973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139121852 + ... + 139122077.

It is an arithmetic number, because the mean of its divisors is an integer number (7929952005).

Almost surely, 2^31441563977 is an apocalyptic number.

It is an amenable number.

31441563977 is a deficient number, since it is larger than the sum of its proper divisors (278244043).

31441563977 is a wasteful number, since it uses less digits than its factorization.

31441563977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278244042.

The product of its digits is 1905120, while the sum is 50.

The spelling of 31441563977 in words is "thirty-one billion, four hundred forty-one million, five hundred sixty-three thousand, nine hundred seventy-seven".