861957481 has 24 divisors (see below), whose sum is σ = 1096917120. Its totient is φ = 669765600.

The previous prime is 861957463. The next prime is 861957539. The reversal of 861957481 is 184759168.

861957481 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 861957481 - 2¹³ = 861949289 is a prime.

It is a super-2 number, since 2×861957481² = 1485941398103730722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861957451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207616 + ... + 211726.

It is an arithmetic number, because the mean of its divisors is an integer number (45704880).

Almost surely, 2^861957481 is an apocalyptic number.

It is an amenable number.

861957481 is a deficient number, since it is larger than the sum of its proper divisors (234959639).

861957481 is a wasteful number, since it uses less digits than its factorization.

861957481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525 (or 4518 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The square root of 861957481 is about 29359.1124014334. The cubic root of 861957481 is about 951.6895073085.

The spelling of 861957481 in words is "eight hundred sixty-one million, nine hundred fifty-seven thousand, four hundred eighty-one".