1231406125 has 8 divisors (see below), whose sum is σ = 1536795000. Its totient is φ = 985124800.

The previous prime is 1231406119. The next prime is 1231406147. The reversal of 1231406125 is 5216041321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 109558089 + 1121848036 = 10467^2 + 33494^2 .

It is not a de Polignac number, because 1231406125 - 2³ = 1231406117 is a prime.

It is a super-2 number, since 2×1231406125² = 3032722089375031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1231406125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4925500 + ... + 4925749.

It is an arithmetic number, because the mean of its divisors is an integer number (192099375).

Almost surely, 2^1231406125 is an apocalyptic number.

It is an amenable number.

1231406125 is a deficient number, since it is larger than the sum of its proper divisors (305388875).

1231406125 is an frugal number, since it uses more digits than its factorization.

1231406125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9851264 (or 9851254 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1231406125 is about 35091.3967376621. The cubic root of 1231406125 is about 1071.8494015652.

Adding to 1231406125 its reverse (5216041321), we get a palindrome (6447447446).

The spelling of 1231406125 in words is "one billion, two hundred thirty-one million, four hundred six thousand, one hundred twenty-five".