31477201561 has 16 divisors (see below), whose sum is σ = 36035979840. Its totient is φ = 27254059200.

The previous prime is 31477201541. The next prime is 31477201603. The reversal of 31477201561 is 16510277413.

It is a cyclic number.

It is not a de Polignac number, because 31477201561 - 2¹¹ = 31477199513 is a prime.

It is a super-2 number, since 2×31477201561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31477201561.

It is not an unprimeable number, because it can be changed into a prime (31477201501) 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, 605935 + ... + 655828.

It is an arithmetic number, because the mean of its divisors is an integer number (2252248740).

Almost surely, 2^31477201561 is an apocalyptic number.

It is an amenable number.

31477201561 is a deficient number, since it is larger than the sum of its proper divisors (4558778279).

31477201561 is a wasteful number, since it uses less digits than its factorization.

31477201561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261896.

The product of its (nonzero) digits is 35280, while the sum is 37.

Adding to 31477201561 its reverse (16510277413), we get a palindrome (47987478974).

The spelling of 31477201561 in words is "thirty-one billion, four hundred seventy-seven million, two hundred one thousand, five hundred sixty-one".