1531623125 has 10 divisors (see below), whose sum is σ = 1913917038. Its totient is φ = 1225298000.

The previous prime is 1531623089. The next prime is 1531623127. The reversal of 1531623125 is 5213261351.

It can be written as a sum of positive squares in 5 ways, for example, as 912160804 + 619462321 = 30202^2 + 24889^2 .

It is not a de Polignac number, because 1531623125 - 2¹⁰ = 1531622101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531623127) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1224674 + ... + 1225923.

Almost surely, 2^1531623125 is an apocalyptic number.

It is an amenable number.

1531623125 is a deficient number, since it is larger than the sum of its proper divisors (382293913).

1531623125 is an frugal number, since it uses more digits than its factorization.

1531623125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450617 (or 2450602 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 1531623125 is about 39135.9569322126. The cubic root of 1531623125 is about 1152.7026854953.

Adding to 1531623125 its reverse (5213261351), we get a palindrome (6744884476).

The spelling of 1531623125 in words is "one billion, five hundred thirty-one million, six hundred twenty-three thousand, one hundred twenty-five".