61277213 has 2 divisors, whose sum is σ = 61277214. Its totient is φ = 61277212.

The previous prime is 61277207. The next prime is 61277233. The reversal of 61277213 is 31277216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59938564 + 1338649 = 7742^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 61277213 - 2¹⁶ = 61211677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61277233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30638606 + 30638607.

It is an arithmetic number, because the mean of its divisors is an integer number (30638607).

Almost surely, 2^61277213 is an apocalyptic number.

It is an amenable number.

61277213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61277213 is an equidigital number, since it uses as much as digits as its factorization.

61277213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 29.

The square root of 61277213 is about 7827.9763029790. The cubic root of 61277213 is about 394.2451277661.

It can be divided in two parts, 612772 and 13, that multiplied together give a triangular number (7966036 = T₃₉₉₁).

The spelling of 61277213 in words is "sixty-one million, two hundred seventy-seven thousand, two hundred thirteen".