1025642401 has 32 divisors (see below), whose sum is σ = 1259919360. Its totient is φ = 815463936.

The previous prime is 1025642399. The next prime is 1025642411. The reversal of 1025642401 is 1042465201.

It is a happy number.

It is not a de Polignac number, because 1025642401 - 2¹ = 1025642399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1025642411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1380036 + ... + 1380778.

It is an arithmetic number, because the mean of its divisors is an integer number (39372480).

Almost surely, 2^1025642401 is an apocalyptic number.

It is an amenable number.

1025642401 is a deficient number, since it is larger than the sum of its proper divisors (234276959).

1025642401 is a wasteful number, since it uses less digits than its factorization.

1025642401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1025642401 is about 32025.6522337953. The cubic root of 1025642401 is about 1008.4754311288.

The spelling of 1025642401 in words is "one billion, twenty-five million, six hundred forty-two thousand, four hundred one".