101661953 has 4 divisors (see below), whose sum is σ = 101816880. Its totient is φ = 101507028.

The previous prime is 101661949. The next prime is 101661961. The reversal of 101661953 is 359166101.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 101661953 - 2² = 101661949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101661253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76475 + ... + 77792.

It is an arithmetic number, because the mean of its divisors is an integer number (25454220).

Almost surely, 2^101661953 is an apocalyptic number.

It is an amenable number.

101661953 is a deficient number, since it is larger than the sum of its proper divisors (154927).

101661953 is an equidigital number, since it uses as much as digits as its factorization.

101661953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154926.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 101661953 is about 10082.7552286069. The cubic root of 101661953 is about 466.7161359689.

The spelling of 101661953 in words is "one hundred one million, six hundred sixty-one thousand, nine hundred fifty-three".