61138619 has 2 divisors, whose sum is σ = 61138620. Its totient is φ = 61138618.

The previous prime is 61138601. The next prime is 61138621. The reversal of 61138619 is 91683116.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61138619 is a prime.

It is a super-2 number, since 2×61138619² = 7475861466454322, which contains 22 as substring.

Together with 61138621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61131619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569309 + 30569310.

It is an arithmetic number, because the mean of its divisors is an integer number (30569310).

Almost surely, 2^61138619 is an apocalyptic number.

61138619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138619 is an equidigital number, since it uses as much as digits as its factorization.

61138619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 61138619 is about 7819.1188122448. The cubic root of 61138619 is about 393.9476748605.

The spelling of 61138619 in words is "sixty-one million, one hundred thirty-eight thousand, six hundred nineteen".