61909447 has 2 divisors, whose sum is σ = 61909448. Its totient is φ = 61909446.

The previous prime is 61909409. The next prime is 61909469. The reversal of 61909447 is 74490916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61909447 - 2¹⁵ = 61876679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61901447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30954723 + 30954724.

It is an arithmetic number, because the mean of its divisors is an integer number (30954724).

Almost surely, 2^61909447 is an apocalyptic number.

61909447 is a deficient number, since it is larger than the sum of its proper divisors (1).

61909447 is an equidigital number, since it uses as much as digits as its factorization.

61909447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 61909447 is about 7868.2556516677. The cubic root of 61909447 is about 395.5963794707.

The spelling of 61909447 in words is "sixty-one million, nine hundred nine thousand, four hundred forty-seven".