1213551077 has 2 divisors, whose sum is σ = 1213551078. Its totient is φ = 1213551076.

The previous prime is 1213551061. The next prime is 1213551083. The reversal of 1213551077 is 7701553121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 737176801 + 476374276 = 27151^2 + 21826^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213551077 - 2⁴ = 1213551061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213551007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606775538 + 606775539.

It is an arithmetic number, because the mean of its divisors is an integer number (606775539).

Almost surely, 2^1213551077 is an apocalyptic number.

It is an amenable number.

1213551077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213551077 is an equidigital number, since it uses as much as digits as its factorization.

1213551077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 1213551077 is about 34836.0600097083. The cubic root of 1213551077 is about 1066.6436527044.

The spelling of 1213551077 in words is "one billion, two hundred thirteen million, five hundred fifty-one thousand, seventy-seven".