158687761 has 4 divisors (see below), whose sum is σ = 158830192. Its totient is φ = 158545332.

The previous prime is 158687747. The next prime is 158687773. The reversal of 158687761 is 167786851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158687761 - 2¹⁷ = 158556689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158687701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69531 + ... + 71776.

It is an arithmetic number, because the mean of its divisors is an integer number (39707548).

Almost surely, 2^158687761 is an apocalyptic number.

It is an amenable number.

158687761 is a deficient number, since it is larger than the sum of its proper divisors (142431).

158687761 is a wasteful number, since it uses less digits than its factorization.

158687761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142430.

The product of its digits is 564480, while the sum is 49.

The square root of 158687761 is about 12597.1330468484. The cubic root of 158687761 is about 541.3952953680.

The spelling of 158687761 in words is "one hundred fifty-eight million, six hundred eighty-seven thousand, seven hundred sixty-one".