245342691 has 24 divisors (see below), whose sum is σ = 409344624. Its totient is φ = 139944960.

The previous prime is 245342663. The next prime is 245342717. The reversal of 245342691 is 196243542.

It is a happy number.

It is not a de Polignac number, because 245342691 - 2¹⁹ = 244818403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245342621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71206 + ... + 74571.

It is an arithmetic number, because the mean of its divisors is an integer number (17056026).

Almost surely, 2^245342691 is an apocalyptic number.

245342691 is a deficient number, since it is larger than the sum of its proper divisors (164001933).

245342691 is a wasteful number, since it uses less digits than its factorization.

245342691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145811 (or 145808 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 245342691 is about 15663.4188796699. The cubic root of 245342691 is about 626.0240840731.

It can be divided in two parts, 24534 and 2691, that added together give a square (27225 = 165²).

The spelling of 245342691 in words is "two hundred forty-five million, three hundred forty-two thousand, six hundred ninety-one".