97661261 has 4 divisors (see below), whose sum is σ = 98364000. Its totient is φ = 96958524.

The previous prime is 97661237. The next prime is 97661279. The reversal of 97661261 is 16216679.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16216679 = 23 ⋅705073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97661261 is a prime.

It is a super-2 number, since 2×97661261² = 19075443800220242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97661231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351161 + ... + 351438.

It is an arithmetic number, because the mean of its divisors is an integer number (24591000).

Almost surely, 2^97661261 is an apocalyptic number.

It is an amenable number.

97661261 is a deficient number, since it is larger than the sum of its proper divisors (702739).

97661261 is a wasteful number, since it uses less digits than its factorization.

97661261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702738.

The product of its digits is 27216, while the sum is 38.

The square root of 97661261 is about 9882.3712235475. The cubic root of 97661261 is about 460.5118137529.

The spelling of 97661261 in words is "ninety-seven million, six hundred sixty-one thousand, two hundred sixty-one".