1901231225 has 24 divisors (see below), whose sum is σ = 2402922840. Its totient is φ = 1491840000.

The previous prime is 1901231203. The next prime is 1901231251. The reversal of 1901231225 is 5221321091.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 731864809 + 1169366416 = 27053^2 + 34196^2 .

It is not a de Polignac number, because 1901231225 - 2⁶ = 1901231161 is a prime.

It is a super-2 number, since 2×1901231225² = 7229360341830001250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1901231194 and 1901231203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 609971 + ... + 613079.

It is an arithmetic number, because the mean of its divisors is an integer number (100121785).

Almost surely, 2^1901231225 is an apocalyptic number.

It is an amenable number.

1901231225 is a deficient number, since it is larger than the sum of its proper divisors (501691615).

1901231225 is a wasteful number, since it uses less digits than its factorization.

1901231225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1901231225 is about 43603.1102675027. The cubic root of 1901231225 is about 1238.8298067577.

The spelling of 1901231225 in words is "one billion, nine hundred one million, two hundred thirty-one thousand, two hundred twenty-five".