261828403 has 2 divisors, whose sum is σ = 261828404. Its totient is φ = 261828402.

The previous prime is 261828377. The next prime is 261828451. The reversal of 261828403 is 304828162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261828403 is a prime.

It is a super-2 number, since 2×261828403² = 137108225235060818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261828473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130914201 + 130914202.

It is an arithmetic number, because the mean of its divisors is an integer number (130914202).

Almost surely, 2^261828403 is an apocalyptic number.

261828403 is a deficient number, since it is larger than the sum of its proper divisors (1).

261828403 is an equidigital number, since it uses as much as digits as its factorization.

261828403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 261828403 is about 16181.1125390067. The cubic root of 261828403 is about 639.7430633670.

The spelling of 261828403 in words is "two hundred sixty-one million, eight hundred twenty-eight thousand, four hundred three".