1025400031 has 4 divisors (see below), whose sum is σ = 1026461392. Its totient is φ = 1024338672.

The previous prime is 1025400029. The next prime is 1025400049. The reversal of 1025400031 is 1300045201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1025400031 - 2¹ = 1025400029 is a prime.

It is a super-2 number, since 2×1025400031² = 2102890447149601922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1025399978 and 1025400014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025400001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529230 + ... + 531163.

It is an arithmetic number, because the mean of its divisors is an integer number (256615348).

Almost surely, 2^1025400031 is an apocalyptic number.

1025400031 is a deficient number, since it is larger than the sum of its proper divisors (1061361).

1025400031 is an equidigital number, since it uses as much as digits as its factorization.

1025400031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061360.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1025400031 is about 32021.8680123443. The cubic root of 1025400031 is about 1008.3959871154.

Adding to 1025400031 its reverse (1300045201), we get a palindrome (2325445232).

The spelling of 1025400031 in words is "one billion, twenty-five million, four hundred thousand, thirty-one".