1261500977 has 8 divisors (see below), whose sum is σ = 1413377472. Its totient is φ = 1115823600.

The previous prime is 1261500973. The next prime is 1261500983. The reversal of 1261500977 is 7790051621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261500977 - 2² = 1261500973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261500977.

It is not an unprimeable number, because it can be changed into a prime (1261500973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549349 + ... + 1550162.

It is an arithmetic number, because the mean of its divisors is an integer number (176672184).

Almost surely, 2^1261500977 is an apocalyptic number.

It is an amenable number.

1261500977 is a deficient number, since it is larger than the sum of its proper divisors (151876495).

1261500977 is a wasteful number, since it uses less digits than its factorization.

1261500977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099559.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 1261500977 is about 35517.6150240975. The cubic root of 1261500977 is about 1080.5110113160.

The spelling of 1261500977 in words is "one billion, two hundred sixty-one million, five hundred thousand, nine hundred seventy-seven".