1263252155 has 32 divisors (see below), whose sum is σ = 1673844480. Its totient is φ = 907620480.

The previous prime is 1263252073. The next prime is 1263252157. The reversal of 1263252155 is 5512523621.

It is not a de Polignac number, because 1263252155 - 2²² = 1259057851 is a prime.

It is a super-2 number, since 2×1263252155² = 3191612014224288050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1263252157) 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, 2851364 + ... + 2851806.

It is an arithmetic number, because the mean of its divisors is an integer number (52307640).

Almost surely, 2^1263252155 is an apocalyptic number.

1263252155 is a deficient number, since it is larger than the sum of its proper divisors (410592325).

1263252155 is a wasteful number, since it uses less digits than its factorization.

1263252155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its digits is 18000, while the sum is 32.

The square root of 1263252155 is about 35542.2587211336. The cubic root of 1263252155 is about 1081.0107578537.

Adding to 1263252155 its reverse (5512523621), we get a palindrome (6775775776).

The spelling of 1263252155 in words is "one billion, two hundred sixty-three million, two hundred fifty-two thousand, one hundred fifty-five".