31401621 has 16 divisors (see below), whose sum is σ = 46662400. Its totient is φ = 20870784.

The previous prime is 31401619. The next prime is 31401637. The reversal of 31401621 is 12610413.

It is a happy number.

31401621 is a `hidden beast` number, since 3 + 1 + 40 + 1 + 621 = 666.

It is not a de Polignac number, because 31401621 - 2¹ = 31401619 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31401594 and 31401603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401221) 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, 8325 + ... + 11493.

It is an arithmetic number, because the mean of its divisors is an integer number (2916400).

Almost surely, 2^31401621 is an apocalyptic number.

It is an amenable number.

31401621 is a deficient number, since it is larger than the sum of its proper divisors (15260779).

31401621 is a wasteful number, since it uses less digits than its factorization.

31401621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545 (or 3539 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31401621 is about 5603.7149285095. The cubic root of 31401621 is about 315.4888554544.

It can be divided in two parts, 3140 and 1621, that added together give a square (4761 = 69²).

The spelling of 31401621 in words is "thirty-one million, four hundred one thousand, six hundred twenty-one".