1025525421 has 16 divisors (see below), whose sum is σ = 1528624320. Its totient is φ = 679486320.

The previous prime is 1025525393. The next prime is 1025525441. The reversal of 1025525421 is 1245255201.

1025525421 is a `hidden beast` number, since 102 + 552 + 5 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 1025525421 - 2¹⁸ = 1025263277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025525441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112110 + ... + 120911.

It is an arithmetic number, because the mean of its divisors is an integer number (95539020).

Almost surely, 2^1025525421 is an apocalyptic number.

It is an amenable number.

1025525421 is a deficient number, since it is larger than the sum of its proper divisors (503098899).

1025525421 is a wasteful number, since it uses less digits than its factorization.

1025525421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233193 (or 233187 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1025525421 is about 32023.8258332761. The cubic root of 1025525421 is about 1008.4370889993.

The spelling of 1025525421 in words is "one billion, twenty-five million, five hundred twenty-five thousand, four hundred twenty-one".