1200977681 has 2 divisors, whose sum is σ = 1200977682. Its totient is φ = 1200977680.

The previous prime is 1200977663. The next prime is 1200977711. The reversal of 1200977681 is 1867790021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079779600 + 121198081 = 32860^2 + 11009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200977681 is a prime.

It is a super-2 number, since 2×1200977681² = 2884694780520275522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200977651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600488840 + 600488841.

It is an arithmetic number, because the mean of its divisors is an integer number (600488841).

Almost surely, 2^1200977681 is an apocalyptic number.

It is an amenable number.

1200977681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200977681 is an equidigital number, since it uses as much as digits as its factorization.

1200977681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 1200977681 is about 34655.1248879585. The cubic root of 1200977681 is about 1062.9470855900.

The spelling of 1200977681 in words is "one billion, two hundred million, nine hundred seventy-seven thousand, six hundred eighty-one".