191992945 has 16 divisors (see below), whose sum is σ = 233754048. Its totient is φ = 151369920.

The previous prime is 191992943. The next prime is 191992949. The reversal of 191992945 is 549299191.

191992945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191992945 - 2¹ = 191992943 is a prime.

It is a super-2 number, since 2×191992945² = 73722581859546050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191992943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101902 + ... + 103768.

It is an arithmetic number, because the mean of its divisors is an integer number (14609628).

Almost surely, 2^191992945 is an apocalyptic number.

It is an amenable number.

191992945 is a deficient number, since it is larger than the sum of its proper divisors (41761103).

191992945 is a wasteful number, since it uses less digits than its factorization.

191992945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160.

The product of its digits is 262440, while the sum is 49.

The square root of 191992945 is about 13856.1518828281. The cubic root of 191992945 is about 576.8927620151.

It can be divided in two parts, 1919 and 92945, that added together give a square (94864 = 308²).

The spelling of 191992945 in words is "one hundred ninety-one million, nine hundred ninety-two thousand, nine hundred forty-five".