1263161251 has 32 divisors (see below), whose sum is σ = 1517564160. Its totient is φ = 1038259200.

The previous prime is 1263161239. The next prime is 1263161279. The reversal of 1263161251 is 1521613621.

It is not a de Polignac number, because 1263161251 - 2⁹ = 1263160739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263161201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 512460 + ... + 514918.

It is an arithmetic number, because the mean of its divisors is an integer number (47423880).

Almost surely, 2^1263161251 is an apocalyptic number.

1263161251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1263161251 is a deficient number, since it is larger than the sum of its proper divisors (254402909).

1263161251 is a wasteful number, since it uses less digits than its factorization.

1263161251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595.

The product of its digits is 2160, while the sum is 28.

The square root of 1263161251 is about 35540.9798823837. The cubic root of 1263161251 is about 1080.9848272800.

Adding to 1263161251 its reverse (1521613621), we get a palindrome (2784774872).

The spelling of 1263161251 in words is "one billion, two hundred sixty-three million, one hundred sixty-one thousand, two hundred fifty-one".