1815290401 has 2 divisors, whose sum is σ = 1815290402. Its totient is φ = 1815290400.

The previous prime is 1815290371. The next prime is 1815290423. The reversal of 1815290401 is 1040925181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1665864225 + 149426176 = 40815^2 + 12224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815290401 - 2⁷ = 1815290273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1815290431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907645200 + 907645201.

It is an arithmetic number, because the mean of its divisors is an integer number (907645201).

Almost surely, 2^1815290401 is an apocalyptic number.

It is an amenable number.

1815290401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815290401 is an equidigital number, since it uses as much as digits as its factorization.

1815290401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1815290401 is about 42606.2249090435. The cubic root of 1815290401 is about 1219.8751106144.

The spelling of 1815290401 in words is "one billion, eight hundred fifteen million, two hundred ninety thousand, four hundred one".