1021000154 has 4 divisors (see below), whose sum is σ = 1531500234. Its totient is φ = 510500076.

The previous prime is 1021000139. The next prime is 1021000157. The reversal of 1021000154 is 4510001201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4510001201 = 2083 ⋅2165147.

It can be written as a sum of positive squares in only one way, i.e., 993699529 + 27300625 = 31523^2 + 5225^2 .

It is a super-4 number, since 4×1021000154⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021000157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255250037 + ... + 255250040.

Almost surely, 2^1021000154 is an apocalyptic number.

1021000154 is a deficient number, since it is larger than the sum of its proper divisors (510500080).

1021000154 is an equidigital number, since it uses as much as digits as its factorization.

1021000154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510500079.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1021000154 is about 31953.0930271234. The cubic root of 1021000154 is about 1006.9516144116.

Adding to 1021000154 its reverse (4510001201), we get a palindrome (5531001355).

The spelling of 1021000154 in words is "one billion, twenty-one million, one hundred fifty-four", and thus it is an aban number.