1901815825 has 48 divisors (see below), whose sum is σ = 2970115456. Its totient is φ = 1175731200.

The previous prime is 1901815733. The next prime is 1901815829. The reversal of 1901815825 is 5285181091.

It is not a de Polignac number, because 1901815825 - 2¹⁹ = 1901291537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1901815829) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88105 + ... + 107545.

Almost surely, 2^1901815825 is an apocalyptic number.

It is an amenable number.

1901815825 is a deficient number, since it is larger than the sum of its proper divisors (1068299631).

1901815825 is a wasteful number, since it uses less digits than its factorization.

1901815825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19514 (or 19509 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 40.

The square root of 1901815825 is about 43609.8134024900. The cubic root of 1901815825 is about 1238.9567675888.

It can be divided in two parts, 19018 and 15825, that added together give a palindrome (34843).

The spelling of 1901815825 in words is "one billion, nine hundred one million, eight hundred fifteen thousand, eight hundred twenty-five".