155199761 has 4 divisors (see below), whose sum is σ = 156384624. Its totient is φ = 154014900.

The previous prime is 155199743. The next prime is 155199767. The reversal of 155199761 is 167991551.

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 155199761 - 2¹⁴ = 155183377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155199767) 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, 592235 + ... + 592496.

It is an arithmetic number, because the mean of its divisors is an integer number (39096156).

Almost surely, 2^155199761 is an apocalyptic number.

It is an amenable number.

155199761 is a deficient number, since it is larger than the sum of its proper divisors (1184863).

155199761 is a wasteful number, since it uses less digits than its factorization.

155199761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184862.

The product of its digits is 85050, while the sum is 44.

The square root of 155199761 is about 12457.9196096299. The cubic root of 155199761 is about 537.3992005679.

The spelling of 155199761 in words is "one hundred fifty-five million, one hundred ninety-nine thousand, seven hundred sixty-one".