1261162503 has 6 divisors (see below), whose sum is σ = 1821679184. Its totient is φ = 840774996.

The previous prime is 1261162499. The next prime is 1261162517. The reversal of 1261162503 is 3052611621.

1261162503 is a `hidden beast` number, since 1 + 26 + 11 + 625 + 0 + 3 = 666.

It is not a de Polignac number, because 1261162503 - 2² = 1261162499 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 (1261122503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70064575 + ... + 70064592.

Almost surely, 2^1261162503 is an apocalyptic number.

1261162503 is a deficient number, since it is larger than the sum of its proper divisors (560516681).

1261162503 is a wasteful number, since it uses less digits than its factorization.

1261162503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140129173 (or 140129170 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1261162503 is about 35512.8498293223. The cubic root of 1261162503 is about 1080.4143651765.

The spelling of 1261162503 in words is "one billion, two hundred sixty-one million, one hundred sixty-two thousand, five hundred three".