61971345 has 16 divisors (see below), whose sum is σ = 110171520. Its totient is φ = 33051312.

The previous prime is 61971317. The next prime is 61971353. The reversal of 61971345 is 54317916.

61971345 is a `hidden beast` number, since 619 + 7 + 1 + 34 + 5 = 666.

It is not a de Polignac number, because 61971345 - 2⁸ = 61971089 is a prime.

It is a super-2 number, since 2×61971345² = 7680895202218050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229389 + ... + 229658.

It is an arithmetic number, because the mean of its divisors is an integer number (6885720).

Almost surely, 2^61971345 is an apocalyptic number.

It is an amenable number.

61971345 is a deficient number, since it is larger than the sum of its proper divisors (48200175).

61971345 is a wasteful number, since it uses less digits than its factorization.

61971345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459061 (or 459055 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 61971345 is about 7872.1880693998. The cubic root of 61971345 is about 395.7281766342.

The spelling of 61971345 in words is "sixty-one million, nine hundred seventy-one thousand, three hundred forty-five".