61987349 has 2 divisors, whose sum is σ = 61987350. Its totient is φ = 61987348.

The previous prime is 61987333. The next prime is 61987351. The reversal of 61987349 is 94378916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57866449 + 4120900 = 7607^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 61987349 - 2⁴ = 61987333 is a prime.

It is a Sophie Germain prime.

Together with 61987351, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61987379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30993674 + 30993675.

It is an arithmetic number, because the mean of its divisors is an integer number (30993675).

Almost surely, 2^61987349 is an apocalyptic number.

It is an amenable number.

61987349 is a deficient number, since it is larger than the sum of its proper divisors (1).

61987349 is an equidigital number, since it uses as much as digits as its factorization.

61987349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 61987349 is about 7873.2044937243. The cubic root of 61987349 is about 395.7622390902.

The spelling of 61987349 in words is "sixty-one million, nine hundred eighty-seven thousand, three hundred forty-nine".