1891540425 has 24 divisors (see below), whose sum is σ = 3128599360. Its totient is φ = 1008417600.

The previous prime is 1891540351. The next prime is 1891540429. The reversal of 1891540425 is 5240451981.

It is not a de Polignac number, because 1891540425 - 2¹² = 1891536329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1891540429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 336135 + ... + 341715.

Almost surely, 2^1891540425 is an apocalyptic number.

1891540425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1891540425 is a deficient number, since it is larger than the sum of its proper divisors (1237058935).

1891540425 is a wasteful number, since it uses less digits than its factorization.

1891540425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10113 (or 10108 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1891540425 is about 43491.8432007658. The cubic root of 1891540425 is about 1236.7213998325.

It can be divided in two parts, 18915 and 40425, that added together give a triangular number (59340 = T₃₄₄).

The spelling of 1891540425 in words is "one billion, eight hundred ninety-one million, five hundred forty thousand, four hundred twenty-five".