61406491 has 2 divisors, whose sum is σ = 61406492. Its totient is φ = 61406490.

The previous prime is 61406473. The next prime is 61406497. The reversal of 61406491 is 19460416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61406491 - 2⁹ = 61405979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61406497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703245 + 30703246.

It is an arithmetic number, because the mean of its divisors is an integer number (30703246).

Almost surely, 2^61406491 is an apocalyptic number.

61406491 is a deficient number, since it is larger than the sum of its proper divisors (1).

61406491 is an equidigital number, since it uses as much as digits as its factorization.

61406491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61406491 is about 7836.2293866374. The cubic root of 61406491 is about 394.5221824755.

The spelling of 61406491 in words is "sixty-one million, four hundred six thousand, four hundred ninety-one".