9151020421 has 4 divisors (see below), whose sum is σ = 9159170272. Its totient is φ = 9142870572.

The previous prime is 9151020409. The next prime is 9151020427. The reversal of 9151020421 is 1240201519.

It is a happy number.

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 9151020421 - 2¹⁵ = 9150987653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9151020427) 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, 4073241 + ... + 4075486.

It is an arithmetic number, because the mean of its divisors is an integer number (2289792568).

Almost surely, 2^9151020421 is an apocalyptic number.

It is an amenable number.

9151020421 is a deficient number, since it is larger than the sum of its proper divisors (8149851).

9151020421 is a wasteful number, since it uses less digits than its factorization.

9151020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149850.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 9151020421 is about 95660.9660258561. The cubic root of 9151020421 is about 2091.6539810542.

The spelling of 9151020421 in words is "nine billion, one hundred fifty-one million, twenty thousand, four hundred twenty-one".