1261948605 has 16 divisors (see below), whose sum is σ = 2023812864. Its totient is φ = 671474240.

The previous prime is 1261948577. The next prime is 1261948609. The reversal of 1261948605 is 5068491621.

It is not a de Polignac number, because 1261948605 - 2⁸ = 1261948349 is a prime.

It is a super-2 number, since 2×1261948605² = 3185028563322892050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261948609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91134 + ... + 104063.

It is an arithmetic number, because the mean of its divisors is an integer number (126488304).

Almost surely, 2^1261948605 is an apocalyptic number.

1261948605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261948605 is a deficient number, since it is larger than the sum of its proper divisors (761864259).

1261948605 is a wasteful number, since it uses less digits than its factorization.

1261948605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195636.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1261948605 is about 35523.9159581260. The cubic root of 1261948605 is about 1080.6387981867.

The spelling of 1261948605 in words is "one billion, two hundred sixty-one million, nine hundred forty-eight thousand, six hundred five".