61511077 has 2 divisors, whose sum is σ = 61511078. Its totient is φ = 61511076.

The previous prime is 61511071. The next prime is 61511089. The reversal of 61511077 is 77011516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59197636 + 2313441 = 7694^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 61511077 - 2²³ = 53122469 is a prime.

It is a super-2 number, since 2×61511077² = 7567225187399858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61511071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755538 + 30755539.

It is an arithmetic number, because the mean of its divisors is an integer number (30755539).

Almost surely, 2^61511077 is an apocalyptic number.

It is an amenable number.

61511077 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511077 is an equidigital number, since it uses as much as digits as its factorization.

61511077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 28.

The square root of 61511077 is about 7842.8997826059. The cubic root of 61511077 is about 394.7460355420.

The spelling of 61511077 in words is "sixty-one million, five hundred eleven thousand, seventy-seven".