31040819 has 2 divisors, whose sum is σ = 31040820. Its totient is φ = 31040818.

The previous prime is 31040809. The next prime is 31040831. The reversal of 31040819 is 91804013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31040819 - 2¹⁶ = 30975283 is a prime.

It is a super-2 number, since 2×31040819² = 1927064888381522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31040809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15520409 + 15520410.

It is an arithmetic number, because the mean of its divisors is an integer number (15520410).

Almost surely, 2^31040819 is an apocalyptic number.

31040819 is a deficient number, since it is larger than the sum of its proper divisors (1).

31040819 is an equidigital number, since it uses as much as digits as its factorization.

31040819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31040819 is about 5571.4288113553. The cubic root of 31040819 is about 314.2758843541.

The spelling of 31040819 in words is "thirty-one million, forty thousand, eight hundred nineteen".