61969619 has 2 divisors, whose sum is σ = 61969620. Its totient is φ = 61969618.

The previous prime is 61969559. The next prime is 61969631. The reversal of 61969619 is 91696916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61969619 - 2¹² = 61965523 is a prime.

It is a super-2 number, since 2×61969619² = 7680467358010322, which contains 22 as substring.

It is a Sophie Germain prime.

61969619 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (61969519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30984809 + 30984810.

It is an arithmetic number, because the mean of its divisors is an integer number (30984810).

Almost surely, 2^61969619 is an apocalyptic number.

61969619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61969619 is an equidigital number, since it uses as much as digits as its factorization.

61969619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 47.

The square root of 61969619 is about 7872.0784421905. The cubic root of 61969619 is about 395.7245027148.

The spelling of 61969619 in words is "sixty-one million, nine hundred sixty-nine thousand, six hundred nineteen".