61905511 has 2 divisors, whose sum is σ = 61905512. Its totient is φ = 61905510.

The previous prime is 61905479. The next prime is 61905523. The reversal of 61905511 is 11550916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61905511 - 2⁵ = 61905479 is a prime.

It is a super-2 number, since 2×61905511² = 7664584584342242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61905511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61906511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30952755 + 30952756.

It is an arithmetic number, because the mean of its divisors is an integer number (30952756).

Almost surely, 2^61905511 is an apocalyptic number.

61905511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61905511 is an equidigital number, since it uses as much as digits as its factorization.

61905511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 61905511 is about 7868.0055287220. The cubic root of 61905511 is about 395.5879957187.

The spelling of 61905511 in words is "sixty-one million, nine hundred five thousand, five hundred eleven".