1125631501 has 6 divisors (see below), whose sum is σ = 1156877610. Its totient is φ = 1095207696.

The previous prime is 1125631499. The next prime is 1125631513. The reversal of 1125631501 is 1051365211.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 691742601 + 433888900 = 26301^2 + 20830^2 .

It is not a de Polignac number, because 1125631501 - 2¹ = 1125631499 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 (1125631601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409746 + ... + 412483.

It is an arithmetic number, because the mean of its divisors is an integer number (192812935).

Almost surely, 2^1125631501 is an apocalyptic number.

It is an amenable number.

1125631501 is a deficient number, since it is larger than the sum of its proper divisors (31246109).

1125631501 is an frugal number, since it uses more digits than its factorization.

1125631501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822303 (or 822266 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1125631501 is about 33550.4322028793. The cubic root of 1125631501 is about 1040.2364788306.

Adding to 1125631501 its reverse (1051365211), we get a palindrome (2176996712).

The spelling of 1125631501 in words is "one billion, one hundred twenty-five million, six hundred thirty-one thousand, five hundred one".