31400121 has 4 divisors (see below), whose sum is σ = 41866832. Its totient is φ = 20933412.

The previous prime is 31400119. The next prime is 31400123. The reversal of 31400121 is 12100413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (31400119) and next prime (31400123).

It is not a de Polignac number, because 31400121 - 2¹ = 31400119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31400097 and 31400106.

It is not an unprimeable number, because it can be changed into a prime (31400123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5233351 + ... + 5233356.

It is an arithmetic number, because the mean of its divisors is an integer number (10466708).

Almost surely, 2^31400121 is an apocalyptic number.

It is an amenable number.

31400121 is a deficient number, since it is larger than the sum of its proper divisors (10466711).

31400121 is a wasteful number, since it uses less digits than its factorization.

31400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466710.

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

The square root of 31400121 is about 5603.5810871263. The cubic root of 31400121 is about 315.4838319259.

Adding to 31400121 its reverse (12100413), we get a palindrome (43500534).

The spelling of 31400121 in words is "thirty-one million, four hundred thousand, one hundred twenty-one".