31415121 has 20 divisors (see below), whose sum is σ = 48446464. Its totient is φ = 20266200.

The previous prime is 31415119. The next prime is 31415123. The reversal of 31415121 is 12151413.

It is an interprime number because it is at equal distance from previous prime (31415119) and next prime (31415123).

It is not a de Polignac number, because 31415121 - 2¹ = 31415119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31415094 and 31415103.

It is not an unprimeable number, because it can be changed into a prime (31415123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3745 + ... + 8766.

Almost surely, 2^31415121 is an apocalyptic number.

31415121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31415121 is a deficient number, since it is larger than the sum of its proper divisors (17031343).

31415121 is a wasteful number, since it uses less digits than its factorization.

31415121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12554 (or 12545 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 31415121 is about 5604.9193571362. The cubic root of 31415121 is about 315.5340600140.

Adding to 31415121 its reverse (12151413), we get a palindrome (43566534).

The spelling of 31415121 in words is "thirty-one million, four hundred fifteen thousand, one hundred twenty-one".