40215031 has 2 divisors, whose sum is σ = 40215032. Its totient is φ = 40215030.

The previous prime is 40215023. The next prime is 40215037. The reversal of 40215031 is 13051204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40215031 - 2³ = 40215023 is a prime.

It is a super-2 number, since 2×40215031² = 3234497436661922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40214996 and 40215014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40215037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20107515 + 20107516.

It is an arithmetic number, because the mean of its divisors is an integer number (20107516).

Almost surely, 2^40215031 is an apocalyptic number.

40215031 is a deficient number, since it is larger than the sum of its proper divisors (1).

40215031 is an equidigital number, since it uses as much as digits as its factorization.

40215031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40215031 is about 6341.5322280976. The cubic root of 40215031 is about 342.6069241880.

Adding to 40215031 its reverse (13051204), we get a palindrome (53266235).

The spelling of 40215031 in words is "forty million, two hundred fifteen thousand, thirty-one".