280490831 has 2 divisors, whose sum is σ = 280490832. Its totient is φ = 280490830.

The previous prime is 280490827. The next prime is 280490839. The reversal of 280490831 is 138094082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280490831 - 2² = 280490827 is a prime.

It is a super-2 number, since 2×280490831² = 157350212550141122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280490791 and 280490800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280490839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140245415 + 140245416.

It is an arithmetic number, because the mean of its divisors is an integer number (140245416).

Almost surely, 2^280490831 is an apocalyptic number.

280490831 is a deficient number, since it is larger than the sum of its proper divisors (1).

280490831 is an equidigital number, since it uses as much as digits as its factorization.

280490831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 280490831 is about 16747.8604902238. The cubic root of 280490831 is about 654.5953104917.

The spelling of 280490831 in words is "two hundred eighty million, four hundred ninety thousand, eight hundred thirty-one".