1061537991 has 8 divisors (see below), whose sum is σ = 1461041664. Its totient is φ = 684863160.

The previous prime is 1061537963. The next prime is 1061538019. The reversal of 1061537991 is 1997351601.

It is an interprime number because it is at equal distance from previous prime (1061537963) and next prime (1061538019).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1061537991 - 2⁷ = 1061537863 is a prime.

It is a super-2 number, since 2×1061537991² = 2253725812672632162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061537291) 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 7 ways as a sum of consecutive naturals, for example, 5707101 + ... + 5707286.

It is an arithmetic number, because the mean of its divisors is an integer number (182630208).

Almost surely, 2^1061537991 is an apocalyptic number.

1061537991 is a deficient number, since it is larger than the sum of its proper divisors (399503673).

1061537991 is a wasteful number, since it uses less digits than its factorization.

1061537991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414421.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 1061537991 is about 32581.2521398426. The cubic root of 1061537991 is about 1020.1057147256.

The spelling of 1061537991 in words is "one billion, sixty-one million, five hundred thirty-seven thousand, nine hundred ninety-one".