31001421 has 32 divisors (see below), whose sum is σ = 48463488. Its totient is φ = 17418240.

The previous prime is 31001419. The next prime is 31001423. The reversal of 31001421 is 12410013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31001419) and next prime (31001423).

It is not a de Polignac number, because 31001421 - 2¹ = 31001419 is a prime.

It is a super-2 number, since 2×31001421² = 1922176208038482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31001397 and 31001406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001423) 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 31 ways as a sum of consecutive naturals, for example, 40575 + ... + 41331.

It is an arithmetic number, because the mean of its divisors is an integer number (1514484).

Almost surely, 2^31001421 is an apocalyptic number.

It is an amenable number.

31001421 is a deficient number, since it is larger than the sum of its proper divisors (17462067).

31001421 is a wasteful number, since it uses less digits than its factorization.

31001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31001421 is about 5567.8919709348. The cubic root of 31001421 is about 314.1428650603.

Adding to 31001421 its reverse (12410013), we get a palindrome (43411434).

The spelling of 31001421 in words is "thirty-one million, one thousand, four hundred twenty-one".