1611212197 has 16 divisors (see below), whose sum is σ = 1902182400. Its totient is φ = 1335507120.

The previous prime is 1611212173. The next prime is 1611212203. The reversal of 1611212197 is 7912121161.

It is a cyclic number.

It is not a de Polignac number, because 1611212197 - 2¹⁵ = 1611179429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558204 + ... + 561082.

It is an arithmetic number, because the mean of its divisors is an integer number (118886400).

Almost surely, 2^1611212197 is an apocalyptic number.

It is an amenable number.

1611212197 is a deficient number, since it is larger than the sum of its proper divisors (290970203).

1611212197 is a wasteful number, since it uses less digits than its factorization.

1611212197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496.

The product of its digits is 1512, while the sum is 31.

The square root of 1611212197 is about 40139.9077851457. The cubic root of 1611212197 is about 1172.3327935194.

The spelling of 1611212197 in words is "one billion, six hundred eleven million, two hundred twelve thousand, one hundred ninety-seven".