1249992145 has 4 divisors (see below), whose sum is σ = 1499990580. Its totient is φ = 999993712.

The previous prime is 1249992131. The next prime is 1249992151. The reversal of 1249992145 is 5412999421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5412999421 = 73 ⋅74150677.

It can be written as a sum of positive squares in 2 ways, for example, as 362369296 + 887622849 = 19036^2 + 29793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249992145 - 2¹¹ = 1249990097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1249992095 and 1249992104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124999210 + ... + 124999219.

It is an arithmetic number, because the mean of its divisors is an integer number (374997645).

Almost surely, 2^1249992145 is an apocalyptic number.

It is an amenable number.

1249992145 is a deficient number, since it is larger than the sum of its proper divisors (249998435).

1249992145 is an equidigital number, since it uses as much as digits as its factorization.

1249992145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249998434.

The product of its digits is 233280, while the sum is 46.

The square root of 1249992145 is about 35355.2279726775. The cubic root of 1249992145 is about 1077.2150886000.

The spelling of 1249992145 in words is "one billion, two hundred forty-nine million, nine hundred ninety-two thousand, one hundred forty-five".