195015901 has 4 divisors (see below), whose sum is σ = 196504704. Its totient is φ = 193527100.

The previous prime is 195015869. The next prime is 195015907. The reversal of 195015901 is 109510591.

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: 109510591 = 2447 ⋅44753.

It is a cyclic number.

It is not a de Polignac number, because 195015901 - 2⁵ = 195015869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195015907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744205 + ... + 744466.

It is an arithmetic number, because the mean of its divisors is an integer number (49126176).

Almost surely, 2^195015901 is an apocalyptic number.

It is an amenable number.

195015901 is a deficient number, since it is larger than the sum of its proper divisors (1488803).

195015901 is a wasteful number, since it uses less digits than its factorization.

195015901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488802.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 195015901 is about 13964.8093792934. The cubic root of 195015901 is about 579.9047614134.

The spelling of 195015901 in words is "one hundred ninety-five million, fifteen thousand, nine hundred one".