1261371069 has 32 divisors (see below), whose sum is σ = 2248064000. Its totient is φ = 682845552.

The previous prime is 1261371061. The next prime is 1261371071. The reversal of 1261371069 is 9601731621.

It is not a de Polignac number, because 1261371069 - 2³ = 1261371061 is a prime.

It is a super-2 number, since 2×1261371069² = 3182113947420405522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261371061) 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, 172039 + ... + 179220.

It is an arithmetic number, because the mean of its divisors is an integer number (70252000).

Almost surely, 2^1261371069 is an apocalyptic number.

1261371069 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1261371069 is a deficient number, since it is larger than the sum of its proper divisors (986692931).

1261371069 is a wasteful number, since it uses less digits than its factorization.

1261371069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351294 (or 351288 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1261371069 is about 35515.7861943108. The cubic root of 1261371069 is about 1080.4739200928.

The spelling of 1261371069 in words is "one billion, two hundred sixty-one million, three hundred seventy-one thousand, sixty-nine".