1245160261 has 4 divisors (see below), whose sum is σ = 1245448224. Its totient is φ = 1244872300.

The previous prime is 1245160199. The next prime is 1245160277. The reversal of 1245160261 is 1620615421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1620615421 = 83 ⋅19525487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245160261 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 (1245160561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137395 + ... + 146176.

It is an arithmetic number, because the mean of its divisors is an integer number (311362056).

Almost surely, 2^1245160261 is an apocalyptic number.

It is an amenable number.

1245160261 is a deficient number, since it is larger than the sum of its proper divisors (287963).

1245160261 is an equidigital number, since it uses as much as digits as its factorization.

1245160261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287962.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1245160261 is about 35286.8284349841. The cubic root of 1245160261 is about 1075.8252933437.

Adding to 1245160261 its reverse (1620615421), we get a palindrome (2865775682).

It can be divided in two parts, 1245160 and 261, that added together give a palindrome (1245421).

The spelling of 1245160261 in words is "one billion, two hundred forty-five million, one hundred sixty thousand, two hundred sixty-one".