1611961907 has 2 divisors, whose sum is σ = 1611961908. Its totient is φ = 1611961906.

The previous prime is 1611961903. The next prime is 1611961937. The reversal of 1611961907 is 7091691161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1611961907 - 2² = 1611961903 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611961903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805980953 + 805980954.

It is an arithmetic number, because the mean of its divisors is an integer number (805980954).

Almost surely, 2^1611961907 is an apocalyptic number.

1611961907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611961907 is an equidigital number, since it uses as much as digits as its factorization.

1611961907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 1611961907 is about 40149.2454100946. The cubic root of 1611961907 is about 1172.5145972848.

The spelling of 1611961907 in words is "one billion, six hundred eleven million, nine hundred sixty-one thousand, nine hundred seven".