31401555601561 has 8 divisors (see below), whose sum is σ = 31437534832704. Its totient is φ = 31365592407600.

The previous prime is 31401555601541. The next prime is 31401555601573. The reversal of 31401555601561 is 16510655510413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31401555601561 - 2¹⁷ = 31401555470489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31401555601541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88765 + ... + 7925338.

It is an arithmetic number, because the mean of its divisors is an integer number (3929691854088).

Almost surely, 2^{31401555601561} is an apocalyptic number.

It is an amenable number.

31401555601561 is a deficient number, since it is larger than the sum of its proper divisors (35979231143).

31401555601561 is a wasteful number, since it uses less digits than its factorization.

31401555601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018591.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 31401555601561 in words is "thirty-one trillion, four hundred one billion, five hundred fifty-five million, six hundred one thousand, five hundred sixty-one".