61519553 has 2 divisors, whose sum is σ = 61519554. Its totient is φ = 61519552.

The previous prime is 61519519. The next prime is 61519571. The reversal of 61519553 is 35591516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54272689 + 7246864 = 7367^2 + 2692^2 .

It is a cyclic number.

It is not a de Polignac number, because 61519553 - 2⁶ = 61519489 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61519153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30759776 + 30759777.

It is an arithmetic number, because the mean of its divisors is an integer number (30759777).

Almost surely, 2^61519553 is an apocalyptic number.

It is an amenable number.

61519553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61519553 is an equidigital number, since it uses as much as digits as its factorization.

61519553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20250, while the sum is 35.

The square root of 61519553 is about 7843.4401253532. The cubic root of 61519553 is about 394.7641662261.

The spelling of 61519553 in words is "sixty-one million, five hundred nineteen thousand, five hundred fifty-three".