61591069 has 2 divisors, whose sum is σ = 61591070. Its totient is φ = 61591068.

The previous prime is 61591043. The next prime is 61591109. The reversal of 61591069 is 96019516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45091225 + 16499844 = 6715^2 + 4062^2 .

It is a cyclic number.

It is not a de Polignac number, because 61591069 - 2¹³ = 61582877 is a prime.

It is a super-2 number, since 2×61591069² = 7586919561125522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61591169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30795534 + 30795535.

It is an arithmetic number, because the mean of its divisors is an integer number (30795535).

Almost surely, 2^61591069 is an apocalyptic number.

It is an amenable number.

61591069 is a deficient number, since it is larger than the sum of its proper divisors (1).

61591069 is an equidigital number, since it uses as much as digits as its factorization.

61591069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 61591069 is about 7847.9977701322. The cubic root of 61591069 is about 394.9170770758.

The spelling of 61591069 in words is "sixty-one million, five hundred ninety-one thousand, sixty-nine".