61555499 has 2 divisors, whose sum is σ = 61555500. Its totient is φ = 61555498.

The previous prime is 61555493. The next prime is 61555523. The reversal of 61555499 is 99455516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61555499 - 2¹⁶ = 61489963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61555493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777749 + 30777750.

It is an arithmetic number, because the mean of its divisors is an integer number (30777750).

Almost surely, 2^61555499 is an apocalyptic number.

61555499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555499 is an equidigital number, since it uses as much as digits as its factorization.

61555499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 44.

The square root of 61555499 is about 7845.7312597361. The cubic root of 61555499 is about 394.8410384244.

The spelling of 61555499 in words is "sixty-one million, five hundred fifty-five thousand, four hundred ninety-nine".