61975691 has 2 divisors, whose sum is σ = 61975692. Its totient is φ = 61975690.

The previous prime is 61975681. The next prime is 61975699. The reversal of 61975691 is 19657916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61975691 is a prime.

It is a super-3 number, since 3×61975691³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (61975699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30987845 + 30987846.

It is an arithmetic number, because the mean of its divisors is an integer number (30987846).

Almost surely, 2^61975691 is an apocalyptic number.

61975691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61975691 is an equidigital number, since it uses as much as digits as its factorization.

61975691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 44.

The square root of 61975691 is about 7872.4640996323. The cubic root of 61975691 is about 395.7374271163.

The spelling of 61975691 in words is "sixty-one million, nine hundred seventy-five thousand, six hundred ninety-one".