1029557661 has 24 divisors (see below), whose sum is σ = 1511271552. Its totient is φ = 622987200.

The previous prime is 1029557653. The next prime is 1029557687. The reversal of 1029557661 is 1667559201.

It is not a de Polignac number, because 1029557661 - 2³ = 1029557653 is a prime.

It is a super-3 number, since 3×1029557661³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1029557651) 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, 274380 + ... + 278106.

It is an arithmetic number, because the mean of its divisors is an integer number (62969648).

Almost surely, 2^1029557661 is an apocalyptic number.

1029557661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1029557661 is a deficient number, since it is larger than the sum of its proper divisors (481713891).

1029557661 is a wasteful number, since it uses less digits than its factorization.

1029557661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 1029557661 is about 32086.7209449641. The cubic root of 1029557661 is about 1009.7570441332.

The spelling of 1029557661 in words is "one billion, twenty-nine million, five hundred fifty-seven thousand, six hundred sixty-one".