1230561977 has 4 divisors (see below), whose sum is σ = 1241452020. Its totient is φ = 1219671936.

The previous prime is 1230561973. The next prime is 1230561991. The reversal of 1230561977 is 7791650321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176650681 + 1053911296 = 13291^2 + 32464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230561977 - 2² = 1230561973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230561973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5444852 + ... + 5445077.

It is an arithmetic number, because the mean of its divisors is an integer number (310363005).

Almost surely, 2^1230561977 is an apocalyptic number.

It is an amenable number.

1230561977 is a deficient number, since it is larger than the sum of its proper divisors (10890043).

1230561977 is a wasteful number, since it uses less digits than its factorization.

1230561977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890042.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1230561977 is about 35079.3668272391. The cubic root of 1230561977 is about 1071.6044224473.

It can be divided in two parts, 12305 and 61977, that multiplied together give a triangular number (762626985 = T₃₉₀₅₄).

The spelling of 1230561977 in words is "one billion, two hundred thirty million, five hundred sixty-one thousand, nine hundred seventy-seven".