1261602025 has 6 divisors (see below), whose sum is σ = 1564386542. Its totient is φ = 1009281600.

The previous prime is 1261602019. The next prime is 1261602031. The reversal of 1261602025 is 5202061621.

It is an interprime number because it is at equal distance from previous prime (1261602019) and next prime (1261602031).

It can be written as a sum of positive squares in 3 ways, for example, as 50353216 + 1211248809 = 7096^2 + 34803^2 .

It is not a de Polignac number, because 1261602025 - 2¹⁷ = 1261470953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 50464081 = 1261602025 / (1 + 2 + 6 + 1 + 6 + 0 + 2 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25232016 + ... + 25232065.

Almost surely, 2^1261602025 is an apocalyptic number.

It is an amenable number.

1261602025 is a deficient number, since it is larger than the sum of its proper divisors (302784517).

1261602025 is an equidigital number, since it uses as much as digits as its factorization.

1261602025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50464091 (or 50464086 counting only the distinct ones).

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

The square root of 1261602025 is about 35519.0375010360. The cubic root of 1261602025 is about 1080.5398606956.

Adding to 1261602025 its reverse (5202061621), we get a palindrome (6463663646).

The spelling of 1261602025 in words is "one billion, two hundred sixty-one million, six hundred two thousand, twenty-five".